* Fix problems compiling u8glib utf8 support on Arduino
* Change header in auto-generated font data
* Change include in font gen scripts

Support env MARLIN_LANGS for user select generated language, and update doc; update script to generate dogm_font_data_ISO10646_1.h automatically.

Based on #7862, #7846 by @rmoravcik

- `mfadd` adds and fetches a user’s fork of Marlin
- `mfqp` invokes `git commit -m`, `mfrb`, `git push -f`

For speeding up font drawing unify font decent.
Tr and Gr have ben the only fonts with a font decent of -2.
Sorry for some, a bit compressd, but hopefully still readeble symbols.

If ENDSTOP_INTERRUPTS_FEATURE is enabled this tries to set up interrupt routines
for all used endstop pins. If this worked without errors, `endstops.update()` is called
only if one of the endstops changed its state.

The new interrupt routines do not really check the endstops and react upon them. All what they
do, is to set a flag if it makes sense to call the endstop test we are used to.

This can be used on:
* ARM (DUE) based boards - all pins can raise interrupts,
* RAMPS - all 6 endstop pins plus some other on EXT-2 can raise interrupts,
* RAMPS based boards - as long the designers did not change the pins for the endstops or at least left enough,
* all boards, if there are enough pins that can raise interrupts, and you are willing/able to swap with pins dedicated to other purpose.