Fix, cleanup, prettify `G29 O` output

Various leveling-related patches

* Fix Horizontal and Vertical optimization bug.

And drastically reduce the debug code foot print....

* Yeah Baby!

The debug print is going A - OK !

Fixes for DUAL_NOZZLE_DUPLICATION_MODE

Revert "Fix for Meshpositions if printer has negative endstop positions"

Patch DELTA_HEIGHT, BLTOUCH init

Various fixes for compiler warnings

- Only call `set_heaters_for_bltouch` when actually deploying/stowing
- Clear `next_emi_protection` when re-enabling heaters

add BLTouch-related messages in english and (rusty) french;
add missing endstops.h in ultralcd.cpp;
fix misc. compiler warnings;
fix lsf_reset - ZERO macro can't handle a pointer as it would only memset the size of the pointer, not the size of the entire struct

Some minor cleanups to code formatting

Need to define this for Rigidboard V2

Motor current defaults need to be defined for Rigidboard

Fix for Meshpositions if printer has negative endstop positions

Delta auto-calibration updates

Configuration cleanup

Right now G26 doesn't send a notice to the host that it's running.  It's
not until the heaters are at temperature that you know for sure if it's
running or not.

Added host temperature prints so that someone watching the host
interface will see the temperatures change during the warm up period.
Updates are sent every 5 seconds.

Endstop not enabled if pin is zero

Various cleanups for recent merges

PlatformIO-related improvement

Also added the new .pio-related directory to .gitignore, and a few ignores for those who use cmake.