Merge pull request #3720 from jbrazio/feature/host-keepalive

Marlin/Conditionals.h

Marlin/Configuration.h

Marlin/example_configurations/Felix/Configuration.h

Marlin/example_configurations/Hephestos/Configuration.h

Marlin/example_configurations/Hephestos_2/Configuration.h

Marlin/example_configurations/K8200/Configuration.h

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

Marlin/example_configurations/RigidBot/Configuration.h

Marlin/example_configurations/SCARA/Configuration.h

Marlin/example_configurations/TAZ4/Configuration.h

Marlin/example_configurations/WITBOX/Configuration.h

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

Marlin/example_configurations/delta/biv2.5/Configuration.h

Marlin/example_configurations/delta/generic/Configuration.h

.../example_configurations/delta/kossel_mini/Configuration.h

...n/example_configurations/delta/kossel_pro/Configuration.h

...in/example_configurations/delta/kossel_xl/Configuration.h

Marlin/example_configurations/makibox/Configuration.h

Marlin/example_configurations/tvrrug/Round2/Configuration.h