The X_Axis could not home to min while Y_Max endstop was trigged.

- Apply standards to cardreader.*
- Fix minor issues with cardreader.cpp
- Apply standards to some other stale regions

The encrot values are used in only one place, and don’t vary, so remove
redundant references.

This reverts commit fb75a9272d.

- Do field grouping
- Tweak configurations for better grouping

- Parse #if, #ifdef, etc. for rules to enable fields

- Both TMC, L6470 and pin-driven drivers work.
- All can be mixed and matched as needed.

- Reduce calls to millis()
- General cleanup of manage_heaters
- General cleanup of pid autotune
- Formatting here & there
- Macros to clean up and shrink ISR code (reduced by ~364 lines)

Added a second sensor and made them configurable.

Am I the only one who always need to change the thermistortable.h to add
a dummy table??
Ok, it is done. Just set the thermistor to 999 and it will always read
25C. Great for Testing or Development purposes.