"Piano" mount / adapter for MightyBoard to SKR 1.1/1.3/Gen L

This will adapt from a printer which uses the Mightyboard (not positive of version compatibility, but I think they all use the same mounting holes) to mount a range of LPC1768-based 32 bit Chinese boards (SKR 1.1, SKR 1.3, MKS Gen L etc) which all use the same bolt pattern.

This has only been tested on a Qidi Tech 1 (which is basically a rebranded FlashForge Creator Pro) with an SKR 1.3. Should work with a broad range of Makerbot/Flashforge style printers (let me know if it doesn't!). Maintai