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.

Allow enabling volumetric filament on config load

Fix M110 without leading N

Store N in the right variable.
This is too rarely used.

"mea culpa, mea culpa, mea maxima culpa"

Updates to some incorrectly ended strings in the Spanish translation

Update language_de.h

Small corrections

On last commit, some strings were ended with the incorrect character.
This fixes it.

Updates to Spanish language

Reset watchdog in SD init to prevent reboot

From "microseconds" to "milliseconds"

Add missing Spanish language definitions.

If the watchdog is enabled and bootscreen + SD card checks take too long, Marlin may hang at boot time because of the reset loop. We have this happen all the time with the Anet board if no SD card is inserted.

code_value_float tweak

Disable SD Detect for K8400

Correction to #5629

As a showcase function for how to do waiting in the lcd menu, this function should be preserved.

Fix empty Prepare menu

Use index macro instead of e

delay() is milliseconds

Better sanity check for FILAMENT_CHANGE_FEATURE, FILAMENT_RUNOUT_SCRIPT

Add missing Spanish language definitions.

Drop biv2.5 delta configurations

Define ADV_NEVER, ADV_RATE

Allow M600 when dryrun debugging

LIN_ADVANCE with unified stepper ISR