M600 cleanup and bugfix

Fix steps_to_mm for active extruders

Remove some old code comments

M600 wait for heatup, prevent stepper timeout, etc.

Fix broken homing in MBL

LCD call was waiting forever, causing the system to hang.

SD files alphabetical sort in LCD menus

Combine fixes for LIN_ADVANCE and temperature ISR

Reduce memory use by ABL_BILINEAR_SUBDIVISION slightly

If Marlin is inside the temperature ISR, the stepper ISR is enabled. If
a stepper event is now happening Marlin will proceed with the stepper
ISR. Now, at the end of the stepper ISR, the temperatre ISR gets enabled
again. While Marlin proceed the rest of the temperature ISR, it's now
vulnerable to a second ISR call.

Hopefully fixes Marlin #5481

Give encoder pulse/steps conditionals their own block

Make HOTEND_LOOP more consistent, let compiler optimize it

No space after X: or A: in M114 output

guaranteed BLTouch detection

Addressing #5806

Cast DELTA_PRINTABLE_RADIUS to float in sq()

Addressing #5625

To guarantee that the 5mS pulse from a BLTouch is recognized you need to
have the endstops.update() routine run twice in that 5mS period.

At 200 steps per mm, my system has problems  below a feedrate of 120 mm
per minute.

Two things were done to guarantee the two updates within 5mS:
1) In interrupt mode, a check was added to the temperature ISR.  If the
endstop interrupt flag/counter is active then it'll kick off the endstop
update routine every 1mS until the flag/counter is zero.  This
flag/counter is decremented by the temperature ISR AND by the stepper
ISR.

2) In poling mode, code was added to the stepper ISR that will make sure
the ISR runs about every 1.5mS.  The "extra" ISR runs only check the
endstops.  This was done by grabbing the intended ISR delay and, if it's
over 2.0mS, splitting the intended delay into multiple smaller delays.
The first delay can be up to 2.0mS, the next ones 1.5mS (as needed) and
the last no less than 0.5mS.

=========================================

BLTouch error state recovery

If BLTouch already active when deploying the probe then try to reset it
& clear the probe.

If that doesn't fix it then declare an error.

Also added BLTouch init routine to startup section

Thanks to @pavlus for this one

Adjust probe_pt() terminal output to respect probe z-offset

Default DAC values for RigidBoard V2

Updated CMakeLists

French translation : Added missing strings as well as missing accents

pinsDebug for 644/1284 & USB646/1286 families

added conditional compilation for PWMs 1C & 3C

add Teensyduino compatibility

==========================================

changes per review - minor formatting changes

1) remove non-printable character at the end of line 687

2) split a really long comment into two lines

3) got rid of some trailing spaces

============================================

Made pinsDebug_Teensyduino.h the same between this PR and PR 5668 which
is for a re-written pinsDebug.h file.

The changes were:
1) added copyright @ GNU license header
2) a blank line crept in.