[FEATURE]-Add timer to debug console operations to automatically disable debug after expiry

[ndorin]

Is your feature request related to a problem? Please describe.
Currently, setting debug level to > 0 never expires and can cause additional processor overhead if left on unintentionally.

Describe the solution you'd like
Add a timer with a default value whenever the appdebug console command sets the level to > 0. Add an optional argument to the command to explicitly set the timeout to a value different than the default.

This might be a bit tricky to implement with the way the current logic saves the level to a file to persist through reboot. Some thought will have to be put in to consider how to deal with that when the program reboots and restores the previous level.

[ndorin]

@jtalborough Moved this issue to the PepperDashCore library where the affected code resides