- create sled pin definition
- G28 Works with sled

- Make thermal protection for all hotends and/or bed into simple
switches
- Now enable `WATCH_TEMP_PERIOD` when `THERMAL_PROTECTION_HOTENDS` is
enabled
- Move detailed thermal parameters to `Configuration_adv.h`
- Add sanity checks to warn about old configurations
- Change `WATCH_TEMP_PERIOD` to seconds instead of milliseconds

this PR replaces some bools with one char. this will safe 3 bytes and should also be sometimes a little bit faster.

ok N(linenumber) P(bufferremaining)
the host can use this to send the data much faster.

Some pseudo code:
If (bufferremaining > 0)  send command
## as long there is free buffer send command

Also
if (linenumber > lastsend - bufferremaining) send command
## as long last linenumber received is bigger than lastsend (host) - last bufferremaining received

This reverts commit 22e0d2afcb.

Persistent homing message.
Message was declared as an alert, therefore it was persistent.
Updated to message.

This reverts the changes done to the error message for line number mismatches done in commit d43cc2dd5f

Servo.cpp and Servo.h were changed to lowercase in Makefile but not their actual filenames.

- Also move audio feedback into the command
- Added shorthand for `lcd_buzz` availability