More Beeper clean up

Add M410 QuickStop command

and removed some tabs.

Centralised beep code to lcd_buzz().
From gcode_M300() and lcd_quick_feedback().

Enforced max. duration for M300 to 5 seconds.

Corrected description in 'Configuration.h'

LCD_FEEDBACK_FREQUENCY_HZ 0 gives now a silent delay of
LCD_FEEDBACK_FREQUENCY_DURATION_MS.

Corrected wrong order of parameters.

Fixed compilation error "error: stray ‘\357’ in program" 

Added new PID autotune info, to make easy copy & paste results to marlin

Fixed jump in speed at high accelerations on axes with lots of steps

Introduced in commit 697ee2dc and later spread to other files.

I.e., when acceleration * steps per mm > 2,000,000.
This was done by changing MultiU24X24toH16 to take a 32b bit operand.
Removed the claim that stepper.cpp uses the Leib algorithm.

Babystep delay 2us

Fixed M48 mismatch between n and P parameter on documentation

Some minor translations to spanish

Example Configuration for K8200 back in sync

example_configurations\K8200\Configuration.h:
* merge upstream changes from default Configuration.h manually
* add some machine specific comments

Enable all old_z_*_endstop vars for Z_DUAL_ENDSTOPS

- Potentially addressing #1911

Rename servos[] array in Marlin to servo[]

Fix type of code_has_value

Naming and code comments