Version 1.2.4.5

• Bug fix Automatic display of additional axis controls and read-outs for A,B,C
  (I got my Mega 2560 to check)
• Add Arduino Uno/Nano hex vor servo support from
  https://github.com/cprezzi/grbl-servo - variable Servo position via Spindle speed
  https://github.com/robottini/grbl-servo - just two Servo positions for Spindle on/off
• Add Mega2560 hex vor 4th / 5th axis support from https://github.com/fra589/grbl-Mega-5X