Currently, Pause of an SD-Memory card print does not work.    This has been verified to resolve the issue by multiple people.   

I understand more work needs to be done to resolve some of the concerns...

Followup to #12551, addressing #12566

* Optimize target_extruder, ignore T with mixing
* Give G-code Tn parity with tool_change

Fix #12362

In reference to https://github.com/MarlinFirmware/Marlin/pull/12098#issuecomment-436231690

- Followup fixes for menu refactor
- Fix TMC sanity checks, unused var warnings

* Clean up Temperature PID
* Improve EEPROM read/write/validate
* Group `SINGLENOZZLE` saved settings
* Group planner saved settings
* Group filament change saved settings
* Group skew saved settings
* Group `FWRETRACT` saved settings

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

Some of the Rotations did not do the right thing with setting and clearing pixels.
I think it is correct now.   But if not...  It is much closer to being correct.

Make M2719 initialize the Max7219 registers and then run the initialization pattern (if one is specified).