The extrusion speed was wrong due to a not high enough precision of
esteps to XY steps, therefore now the target float values are used to
calculate the ratio between XY movement and extrusion speed.
The e_speed_multiplier8 was replaced by an absolute multiplier called
abs_adv_steps_multiplier8, therefore one multiplication and bitshift can
be saved inside the stepper ISR. Due to this, also extruder_advance_k is
better suited inside the planner and not the stepper files any more.

Enhancements to M43 pins debugging

I stumbled across a name change that'll be used a lot so I'm updateing
the name list.

Mightyboard Revision E preliminary support

Support Z2 min in M119 report

Optimize buffer_line by calculating before wait-for-free-block

Centralize click-handling in the LCD loop

Save hotend_offset array (M218) in EEPROM

Fix Command M420

Add predefined AUTO_FAN_PINs to pins files

Don't trigger endstops that are actually Z2 or probe

#3631 broke z dual endstops. Solved by @Nocturnal42 in https://github.com/MarlinFirmware/Marlin/issues/5078#issuecomment-256572248

Fix for the PR #5088 (Handle M108 in M1 also with ULTIPANEL)

Fix bilinear grid constraints

Follow-up the PR #5087 (Fixed SERVO pins on Azteeg X3), etc

Followup to #5090