made it compile if arduino decides to include files in a differnt order. DEC HEX and stuff now defined in MarlinSerial.h

Conflicts:
	Marlin/temperature.h

get rid of indirect ringbuffer calls, made some inlines, removed virtual and streaming class requirements.

(When using the lower and upper adc input bank)

Add serial checkRx in stepper ISR.
Copied HardwareSerial to MarlinSerial (Needed for checkRx).

first naive attempt to have a offset in the homeing procedure. Does not enable to move into regions not allowed by endstops.

Added simple endstop filter.
Corrected M114 count display.