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Configuration_adv.h changes

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add "live" LCD update

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P & S version

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final (hopefully) tested version

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update M115 capabilities print

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Menu changes portion of the requested changes

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changed USEABLE_HARDWARE_PWM from a function to a series of macros

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changes per review

* Unify M600 and M125 pause features
* Cleanup per thinkyhead's comments
* Rename filament_change_menu_response to advanced_pause_menu_response
* Include HAS_BED_PROBE in QUIET_PROBING
* Update gMax example file
* is_idle() is out of scope without the braces
* Convert FT-i3-2020 to Advance Pause names...
* Allow pause even if not printing

As suggested in
https://github.com/MarlinFirmware/Marlin/issues/5570#issuecomment-283059
065

Also add a hotend indicator to the heating message displayed on the lcd status line.

Init display and show bootscreen later, but init display in `kill()`
to init outputs before the bootscreen delays but being able to display
kill errors.

Based on MarlinFirmware/MarlinDev#200 from @eboston

This is the easiest way to make button pin testing consistent without
renaming all the button pins. Just make a macro especially for testing
if button pins are set, since they are named consistently in the pins
files.

Following up on #3231