Deactivate automatic quit

[EugenZimmermann]

Hi,

I once had a pull request (#28) for deactivating the automatic quit on left/right button click because I need to adjust 2 parameters (one with up/down and another one with left/right) within a single menu if a certain condition is met. Is it possible to make the code for "QUIT Part 2" in the LCDMenuLib2.cpp optional by a configuration bool? Otherwise I will run into the same issue on every update.

Cheers,
Eugen