Allow to separate extrusion and travel acceleration settings using M204,
as Marlin 1.1.x and 2.x does using M204 T.
This allows to reduce the number of instructions required during
printing, since resetting the acceleration for travel moves is no longer
required and can be done a single time during the print.
Provision for this parameter was pre-existing, but not implemented.
M204 has two forms: the lagacy format (Marlin <1.1):
M204 S[print-acc] T[retract-acc]
and the newer format:
M204 P[print-acc] R[retract-acc] T[travel-acc]
The distinction in the MK3 FW is done based on the presence of the P
parameter. If P is seen, the new format is adoped. In the new format
however, M204 T was ignored until this change.
To keep backward compatibility, M204 S[acc] will set both print and
travel acceleration, which is identical in behavior to recent versions
of Marlin.
In file included from sketch/ConfigurationStore.cpp:5:0:
sketch/ConfigurationStore.h: In function 'uint8_t calibration_status_store(uint8_t)':
sketch/ConfigurationStore.h:24:124: warning: no return statement in function returning non-void [-Wreturn-type]
inline uint8_t calibration_status_store(uint8_t status) { eeprom_update_byte((uint8_t*)EEPROM_CALIBRATION_STATUS, status); }
