v0.0.2

Add support for additional outputs - OUTPUT_4 and OUTPUT_5 (for M64/M65 commands)

v0.0.1

Initial implementation of M64 (digital output on) + M65 (digital output off) G-code commands.

Currently 3 outputs are supported - Z/Y/X endstop pins on CNC Board are used as digital output pins.

Example:

M64 P1 - enable output 1 (Z+/Z- pin)
M65 P1 - disable output 1 (Z+/Z- pin)

A lot of original grbl code is gutted to free those pins and remove code that is not-necessary for microlab operations.