Only measure and store filament width when E is going forward.

Redo of #3268 by @jbrazio

Following up on #3231

Addressing #2773

Redo of #2939 rebased against RCBugFix

Introduce additional variable axis_homed to replace axix_known_position
when the coordinate display should indicate the axis is not homed.
This is to distinguish between "not homed" and "inexact position possible
because stepper was disabled".

# Conflicts:
#	Marlin/ultralcd_implementation_hitachi_HD44780.h
solved

Make the output of M105 more similar to Repetier.
Make the text-print pert of M105 an extra function to make it reusable. `print_heaterstates()`
Use `print_heaterstates()` in M019, M190 and M303

Keep "astyled" reformatting

With the introduction of the #if ENABLED(…)

reads better than

* Fix a couple of renames omission and macro expansion errors.

- For some reason it’s easy to forget what BT stands for, but it
doesn’t need an abbreviation.