Snake MINI FW 6.0.1.2 (i3 only)

MINI FW based on 6.0.1. Appendix has to be removed if you have original el. board.
This release is for i3 MK3.3 only. You have to take Prusa i3 MK3 and connect MINI board to it. Bed has to be connected indirectly beacuse the board cannot handle higher bed current used in i3.