Update to language_it.h

Init display and show bootscreen later, but init display in `kill()`
to init outputs before the bootscreen delays but being able to display
kill errors.

update to latest rcbugfix

Fix Travis test for FILAMENTCHANGEENABLE

Fix manual move for multiple extruders

Add macros to move servos

No need to check ULTIPANEL with DOGLCD

Heal the watchdog

Clarify names of prepare_move functions

Wrap all items depending on ULTIPANEL

Improves travis buildroot regexp

  manage_manual_move(); -> ULTIPANEL

Closes #3999: Compilation error with BEEPER_PIN -1

Makr the call of   `manage_manual_move() ` depandent of `ULTIPANEL`

Rename some vars to clarify their relationship to acceleration

Update travis to test for ULTRA and DOG LCD options

New feature: Non blocking tone queue

Throw an error in PID_autotune for E < -1

- `per_sq_second` => `per_s2`
- `per_sqr_second` => `per_s2`
- `axis_steps_per_sqr_second` => `max_acceleration_steps_per_s2`