Fix #10761

Better encapsulation and considerably reduce stepper jitter

`DONT_SWITCH` got lost along the way. Replace it with `DO_SWITCH_EXTRUDER` and adjust the code.

As pointed out in #10731

Use macros that explicitly avoid double-evaluation and can be used for any datatype, replacing `min`, `max`, `abs`, `fabs`, `labs`, and `FABS`.

Co-Authored-By: ejtagle <ejtagle@hotmail.com>

Co-Authored-By: ejtagle <ejtagle@hotmail.com>

* Allow both AD595 and AD8495 in concert
* General temperature code tweaks

Co-Authored-By: perkmeister <perkmeister@users.noreply.github.com>

* Remove obsolete strings
* Tweak some static consts
* Reset LCD status to fallbacks

…and apply to MALYAN_LCD.

Allow the current command to complete when aborting an SD print, otherwise some commands (G28, G29, etc.) will cause trouble.

* Automatically reset stepper timeout in manage_inactivity

Any code that adds moves to the planner can skip resetting the stepper timeout. We can let `idle` / `manage_inactivity` reset the timer whenever it detects any moves in the planner.

* blocks_queued => has_blocks_queued

Fixes #10041

Fix #10004

Fix #9988

Followup to 7e386c7

Thanks Chuck Hellebuyck.