[Keyboard] Add PloopyCo devices (#7935)

* Initial Commit for Ploopyco Trackball

This is a WIP at this point.  Most of it compiles, but the SPI commands are non-functioning as they come from Arduino, so don't exist in LUFA

* Convert SPI commands from arduino to LUFA

But I have no idea if this is actually correct or not

* Update keyboard readme

* Clean up ploopyco trackball

* Update readme

* Update mouse key stuff

* last minutue cleanup

* Add caveat about scroll wheel

* Fixup to code

* Additional fixup

* Add movement multiplier

* Rename folders

* mid changes

* temp

* Got it working!!!!!

* Additional cleanup of code

* Make unused pin calls more compact

* Rotation info

* Add debouncing checks

* Make everything replaceable

* Add info.json

* Include ISP flashing info

* Better handling for user customization

* Reconfigure CPI stuff

* fix issues with debug printing

* Fix tiny scroll issue

* Add and update scroll code from ploopy mouse

* Update licensing

* Add PloopyCo Mouse

* Cleanup and layout stuff

* Move common files to main folder for reuse

* Increase polling rate

* Update image for mouse

* Apply changes from code review

* Add VIA support

1 files changed, 68 insertions, 0 deletions

diff --git a/keyboards/ploopyco/trackball/readme.md b/keyboards/ploopyco/trackball/readme.md
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+# Ploopyco Trackball
+
+![Ploopyco Trackball](https://i.redd.it/j7z0y83txps31.jpg)
+
+It's a DIY, QMK Powered Trackball!!!!
+
+Everything works. However the scroll wheel has some issues and acts very odd.
+
+* Keyboard Maintainer: [PloopyCo](https://github.com/ploopyco), [Drashna Jael're](https://github.com/drashna/), [Germ](https://github.com/germ/)
+* Hardware Supported: ATMega32u4 8MHz(3.3v)  
+* Hardware Availability: [Store](https://ploopy.co), [GitHub](https://github.com/ploopyco)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make ploopyco/trackball:default:flash
+    
+To jump to the bootloader, hold down "Button 4" (immediate right of the trackball) 
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+# Customzing your PloopyCo Trackball
+
+While the defaults are designed so that it can be plugged in and used right away, there are a number of things that you may want to change.  Such as adding DPI control, or to use the ball to scroll while holding a button.   To allow for this sort of control, there is a callback for both the scroll wheel and the mouse censor. 
+
+The default behavior for this is:
+
+```c
+void process_wheel_user(report_mouse_t* mouse_report, int16_t h, int16_t v) {
+    mouse_report->h = h;
+    mouse_report->v = v;
+}
+
+void process_mouse_user(report_mouse_t* mouse_report, int16_t x, int16_t y) {
+    mouse_report->x = x;
+    mouse_report->y = y;
+}
+```
+
+This should allow you to more heavily customize the behavior. 
+
+Alternatively, the `process_wheel` and `process_mouse` functions can both be replaced too, to allow for even more functionality.
+
+Additionally, you can change the DPI/CPI or speed of the trackball by calling `pmw_set_cpi` at any time. And tThe default can be changed by adding a define to the keymap's `config.h` file:
+
+    #define PMW_CPI 1600
+
+# Programming QMK-DFU onto the PloopyCo Trackball
+
+If you would rather have DFU on this board, you can use the QMK-DFU bootloader on the device.  To do so, you want to run: 
+
+    make ploopyco/trackball:default:production
+
+Once you have that, you'll need to [ISP Flash](https://docs.qmk.fm/#/isp_flashing_guide) the chip with the new bootloader hex file created (or the production hex), and set the fuses:
+
+
+| Fuse     | Setting          |
+|----------|------------------|
+| Low      | `0xDF`           |
+| High     | `0xD8` or `0x98` |
+| Extended | `0xCB`           |
+
+Original (Caterina) settings: 
+
+| Fuse     | Setting          |
+|----------|------------------|
+| Low      | `0xFF`           |
+| High     | `0xD8`           |
+| Extended | `0xFE`           |