* Add SquishyTKL
* Add SquishyTKL-FRL
* Adjust readme.md and info.json
* Add JIS support for SquishyTKL
* Fix JIS layout macro
* Fix via layout and keymap
* Migrate SquishyTKL to STM32duino bootloader
* Make chibios conf files generic
* Change TKL via keymap to match number of layers
* Apply chibios changes to FRL as well
* Adjust README regarding flashing with dfu-util
* Add license and header guard