Fix: current_command_args skips digits at the front

Closes #3245

Fix distribution date

Updated Mesh Bed Leveling

axis_known_position -> axis_homed

Code cleanup around MOTOR_CURRENT_PWM options

In all these cases we want the axis to be homed. If we could have lost
some steps is secondary.

Reenables homing seperate axis with DISABLE_X / DISABLE_Y true.

copy of 406992f9dd

Also add mbl.z_offset to the EEPROM, bumping the version to V23.

Fix a compiler warning in ultralcd.cpp

Closes #3235. Fix dogm lcd error when FAN_PIN is defined as -1

Further cleanup of comments, partial Doxygen-style

Following up on #3231

Fix spelling

Added GPLv3 header to all Marlin files

PROBABLE ->PROBEABLE
This is follow-up to #3069?

Toshiba Flash Air Wifi SD card support

Enabling servo usage on boards with PWM current control

Use arduino programming protocol by default for sanguino

Fix MELZI_MAKR3D to use correct motherboard

M120/M121 also set endstops non-homing state

Add Menu Items to initiate M303

Fixes for #3189

Setting a temp is still missing

Adds the parameter U to M303. If U1 is included , it will use the
PID-values from the auto-tune.

Follow-up the PR #3082, etc

Add support for Printrboard RevF

Make DISABLE_INACTIVE_X, etc., true if missing

Send position updates to RH

Patch minor spelling error in cn, en, gl language file headings