* refactor keyboards using ST_STM32F072B_DISCOVERY to use 'MCU = STM32F072'
* refactor keyboards using GENERIC_STM32_F042X6 to use 'MCU = STM32F042'
* refactor keyboards using GENERIC_STM32_F103 to use 'MCU = STM32F103'
* Initial refactor of onekey to support multiple development boards
* Fixes to get teensy lc && 3.2 working
* Add pin tables
* Add caveats to Teensy boards
* Correct bootloader for Elite-C