[jd45] Port jeebak's planck keymap to jd45

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+jeebak's JD45 layout
+=======================
+NOTE: This is a port of jeebak's planck layout, for jd45.
+
+This WIP keymap attempts to minimize fingers straying away from the home row.
+To aid in this endeavor, when additional modifyer keys to switch layers are
+needed, they will be mapped to home row keys. The `keymap.c` file will contain
+the exact changes. The diagrams in this README shows the highlights of the
+changes from the default mappings.
+
+I also decided to change all calls to `persistant_default_layer_set()` to
+`default_layer_set()` since this is my personal perference.
+
+## Macros
+```
+#define ALT_TAB     M(KC_ALT_TAB)
+```
+
+## Base Layers (Qwerty/Colemak/Dvorak)
+These base layers are mostly the same as the default mappings. The interesting
+changes are shown below.
+
+- The `Ctrl/Esc`, will emit an `Escape` when tapped, and act as a `Control` key when held,
+- `GUI/;` as `;` and `GUI`,
+- `Alt/"` as `"` and `Alt`,
+- `Sft/Ent` as `Enter` and `Shift`, and
+- `Hyper/Tab` as `Tab` and `Hyper`
+
+A `TODO` item is to see if it can also act as a `CapsLock` when double-tapped.
+The arrow keys, which have been moved to the
+[TouchCursor](http://martin-stone.github.io/touchcursor/) layer, have been
+replaced with the Media keys as shown. The `MC/kc` key activates the
+`MouseCursor` layer when held, and emits the corresponding `kc` for its layer,
+when tapped.
+```
+  ,---------+------+------+------+------+------+------+------+------+------+------+------+------.
+  |Hyper/Tab|   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  |   [  | Bksp |
+  |---------`------`------`------`------`------`------`------`------`------`------`------`------|
+  | Ctrl/Esc |   A  |   S  | MC/D |   F  |   G  |   H  |   J  |   K  |   L  |GUI/; |   Alt/"    |
+  |----------`------`------`------`------`------`------`------`------`------`------`------------|
+  |   Shift   |   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |  Sft/Ent  |
+  |-----------`------`------`------`------`-----'-------`------`------`------`------`-----------|
+  |   RGUI |  Alt  |  GUI  | Lower | TC/Space | TC/Space |  Raise  |  Vol-  |  Vol+  |   Play   |
+   `-------+-------+-------+-------+---^^^----+---^^^----+---------+--------+--------+----------'
+```
+
+## Lower Layer (Symbols and Function Keys)
+The symbols and functions keys are essentially the same as the default mapping.
+The most notable changes are that the symbol keys from the `RAISE` layer have
+been moved here. The remaining Media keys replace those that are now on the
+base layers. The `BACKLIT` key has also been moved here.
+```
+  ,---------+------+------+------+------+------+------+------+------+------+------+------+------.
+  |   ~     |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  |      | Bksp |
+  |---------`------`------`------`------`------`------`------`------`------`------`------`------|
+  |   [      |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |   "|"      |
+  |----------`------`------`------`------`------`------`------`------`------`------`------------|
+  |   ]       |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |   -  |   =  |   [  |   ]  |    \      |
+  |-----------`------`------`------`------`-----'-------`------`------`------`------`-----------|
+  | Brite  |       |       |       |          |          |         |  Prev  |  Next  |   Mute   |
+   `-------+-------+-------+-------+---^^^----+---^^^----+---------+--------+--------+----------'
+```
+
+## Raise Layer (Numbers and Arithmetic Operators)
+All of the numbers and arithmetic operators are available on this layer. Some
+keys are duplicated for the convenience of their positions. The `0` and `$`
+keys at the far left are for quick access to beginning and end of line in vim.
+```
+  ,---------+------+------+------+------+------+------+------+------+------+------+------+------.
+  |   0     |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  |      | Bksp |
+  |---------`------`------`------`------`------`------`------`------`------`------`------`------|
+  |   $      |   4  |   5  |   6  |   .  |   +  |   .  |   4  |   5  |   6  |   *  |   "|"      |
+  |----------`------`------`------`------`------`------`------`------`------`------`------------|
+  |   =       |   7  |   8  |   9  |   0  |   -  |   .  |   1  |   2  |   3  |   /  |    \      |
+  |-----------`------`------`------`------`-----'-------`------`------`------`------`-----------|
+  | Brite  |       |       |       |          |          |         |  Prev  |  Next  |   Mute   |
+   `-------+-------+-------+-------+---^^^----+---^^^----+---------+--------+--------+----------'
+```
+
+## TouchCursor layer plus personal customizations
+[TouchCursor](http://martin-stone.github.io/touchcursor/) uses the `Space` key
+as the modifier, with the `IJKL` home row keys representing the inverted-T of
+the arrow keys. All of the default TouchCursor keymappings for the right hand
+are represented below. My personalizations include all of the keys shown for
+the left hand. Having the `Alt` and `Shift` keys (as well as the `Control` key
+from the base layers) readily accessible from the home row allows quick word
+jumps and highlighting when used in conjunction with the arrow keys. The
+`Alt-Tab` macro is not only useful under Windows, but also under Mac when used
+with alternative switchers like [HyperSwitch](https://bahoom.com/hyperswitch).
+The `Cmd-Tab` and `Ctrl-Tab` sequences are duplicated for easy access while in
+this layer. The `KC_UNDO, KC_CUT, KC_COPY, KC_PASTE, KC_FIND,` and `KC_AGAIN`
+keycodes do not seem to work. There are macros in place that'll "automatically"
+choose the correct version (`Cmd-Tab` vs. `Alt-Tab`, `Cmd-C` vs. `Ctrl-C`,
+etc.) depending on which layout you've currently selected (`AG_NORM` or
+`AG_SWAP`) in the `_ADJUST` layer. The `Desk_L` and `Desk_R` macros are what I
+use to switch between Virtual Desktops Left/Right. The `Tab_C`, `Tab_N` and
+`Tab_R` are for "Close Tab," "New Tab" and "Reopen Closed Tab" for apps such as
+Google Chrome.
+```
+  ,---------+------+------+------+------+------+------+------+------+------+------+------+------.
+  | AltTab  |CmdTab|CtlTab| GUI  |Shift |  ~   |Insert| Home |  Up  | End  | Bksp |      |      |
+  |---------`------`------`------`------`------`------`------`------`------`------`------`------|
+  |          | Alt  |Space |Tab_C | Find |Again | PgUp | Left | Down |Right |Desk_L|  Desk_R    |
+  |----------`------`------`------`------`------`------`------`------`------`------`------------|
+  |           | Undo | Cut  | Copy |Paste |  `   | PgDn | Del  |Tab_N |Tab_R |iTerm2|           |
+  |-----------`------`------`------`------`-----'-------`------`------`------`------`-----------|
+  |        |       |       |       |          |          |         |        |        |          |
+   `-------+-------+-------+-------+---^^^----+---^^^----+---------+--------+--------+----------'
+```
+
+## Mouse Layer
+The Mouse layer, closely mimics the layout/behaviour of the TouchCursor layer.
+The `D` key (on QWERTY) is used to activate this layer. All 16 keycodes for the
+mouse from the `doc/keycode.txt` file are represented, and logically located,
+IMHO. The left and right click buttons are duplicated; on the right hand side,
+for a quick click here and there, and again on the left hand side for when the
+buttons need to be held for dragging things or highlighting text, thus allowing
+the right hand to be free to use the up/down/left/right actions.
+```
+  ,---------+------+------+------+------+------+------+------+------+------+------+------+------.
+  |         |      |ACCL0 |      |      |      |      |WHL_L |  Up  |WHL_R | BTN2 |      |      |
+  |---------`------`------`------`------`------`------`------`------`------`------`------`------|
+  |          |ACCL2 | BTN2 |      | BTN1 |ACCL1 |WHL_Up| Left | Down |Right | BTN4 |   BTN5     |
+  |----------`------`------`------`------`------`------`------`------`------`------`------------|
+  |           |      |      |      | BTN3 |      |WHL_Dn| BTN1 |      |      | BTN3 |           |
+  |-----------`------`------`------`------`-----'-------`------`------`------`------`-----------|
+  |        |       |       |       |          |          |         |        |        |          |
+   `-------+-------+-------+-------+---^^^----+---^^^----+---------+--------+--------+----------'
+```