Firmware, Make Debug Levels Selectable at Run Time. Through LCD Menu, Rev 0.47

Is your feature request related to a problem? Please describe.
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A problem with firmware often needs to see Debug Statements.
However some of our Debug is in #define guards and unreachable in a device displaying a bug.

Rebooting may clear the bug and the bugs may be hard to reproduce.

There appears to be several locations with in the code where Debug is defined and not globally making it hard to figure out how to use Debug.

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A run time setting through a user interface, the Serial Monitor and or the LCD Menu where we can set Debug levels would help.

A document describing how the Debug Levels work, what they report.
A consistent philosophy of how increasing debug levels reveal additional details would help. Only the highest levels report from inside functions for example. Lower levels are more global.

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This applies to Rev 0.47 Firmware.