* Consolidate variant scripts
* Rename Marlin-local boards
* Simplify variants where possible
* Rename variants
* CHITU_F103 and MEEB_3DP: Maple platform `platformio-build-stm32f1.py` uses the 'board' name, not 'board_build.variant' so folder names match 'board' and not `board_build.variant`.
- Now compiles and works correctly with changes to HAL timers and watchdog.
- Does NOT include awesome work on touch screen function.
- Does have working LCD and SD-based EEPROM.
