Fix stuttering issues on detailed models

- Optimize TFT code for state handling (pause, runout, ...)
- Remove multiple state booleans in favour of a single integer
- Remove obsolete filament runout code
- Increase jerk/accel
- Decrease TX buffer size
- Revert minimum segment time to factory default

Add optional endstop beeps

Enable ENDSTOP_BEEP in Configuration.h to enable a 2KHz beep when endstops are hit. Disabled by default.

Implement heatbed cooldown routine

- M888: Cooldown routine for the Anycubic Ultrabase (EXPERIMENTAL):
This is meant to be placed at the end Gcode of your slicer. It hovers over the print bed and does circular movements while running the fan. Works best with custom fan ducts.
- T<int>: Target bed temperature (min 15°C), 30°C if not specified
- S<int>: Fan speed between 0 and 255, full speed if not specified

Thanks to @kulfuerst for the suggestion!

Implement nozzle reheating on timeout via display

- Raise nozzle timeout to 10 minutes
- Use continue button as reheat trigger
- Manage nozzle_timed_out variable via display
- Add PausedByNozzleTimeout flag to enter correct routine on display
- Bump version to 1.4.3

Tweak M600 display resume

- Add startFileprint(); call to M108 display routine to fix progress and ensure "printing done" gets shown
- Add SD printing check in marlin_main.cpp M600 routine to skip TFTstate if not necessary (e.g. USB printing)
- Move routine to the top again to ensure immediate execution

Set SDPAUSE state on M600 regardless of prior TFTstate

Move the routine to a better position and set the state regardless of SDPRINT status.

This ensures that M600 makes the display show a continue button every time. Before, it was only behaving correctly for the first instance of M600.

Update semantic versioning

Merge branch 'dev'

Merge branch 'dev'

Merge branch 'dev'