When a user executes a User Menu command, the LCD returns to the main menu. If the user has multiple menu items they want to run, such as one menu item per bed leveling corner, then it's better to stay in the User Menu rather than return to the main menu.

This PR modifies Marlin to stay in the User Menu after a command.

20x4 map integration.    Also some minor changes to the UBL Menu layout.     Both 20x4 LCD's and Graphical LCD panels should have similar functionality now.

Fixes #7150

* fix_planner_refresh_e_positioning

* Fix

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add test to Travis

Original Mesh Bed Leveling replacement put at top of UBL Menu Options to
help facilitate the removal of the Original Mesh Bed Leveling.

Radar display (and control) of the UBL Interactive Mesh Editing.

* excentric probe config fix

* undo last commit

* eccentric probe fix

* oops

* !stow after each probe

* deploy/stow fix

* E parameter + bit of cleanup

* comment

* LCD menu fix

Show the Leveling system in use on the About Printer screen.

One click option to manually build UBL mesh.

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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

The menu (commands / scripts) is configurable in `Configuration_adv.h`.

- Added conditionals.
- Changed script handling.
- Slimmed and working!
- Added Status message.
- Returning to lcd status screen now!
- Example Configs Updated.
- Cleanups by @thinkyhead