Merge MegaController & MINIPANEL (PR#2508)

Marlin/Conditionals.h

Marlin/Configuration.h

Marlin/boards.h

Marlin/configurator/config/Configuration.h

Marlin/dogm_lcd_implementation.h

Marlin/example_configurations/Felix/Configuration.h

Marlin/example_configurations/Felix/Configuration_DUAL.h

Marlin/example_configurations/Hephestos/Configuration.h

Marlin/example_configurations/K8200/Configuration.h

...le_configurations/RepRapWorld/Megatronics/Configuration.h

Marlin/example_configurations/SCARA/Configuration.h

Marlin/example_configurations/WITBOX/Configuration.h

...in/example_configurations/adafruit/ST7565/Configuration.h

Marlin/example_configurations/delta/generic/Configuration.h

Marlin/example_configurations/makibox/Configuration.h

Marlin/example_configurations/tvrrug/Round2/Configuration.h

Marlin/pins.h

Marlin/pins_MEGACONTROLLER.h

Marlin/pins_RAMPS_13.h