Originally from #22022
Followup to #21999
- New STM32 env for Creality V4 boards. - Separate Libmaple targets into their own `ini` file. - Temporarily remove unusable targets from `pins.h`. Co-authored-by: ellensp <ellensp@hotmsil.com> Co-authored-by: Scott Lahteine <github@thinkyhead.com>