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[fbdebug] Add panning functionality

Administrator requested to merge feature/fbdebug into master

Add 2 argument to choose between showing the framebuffer screen info and panning the display.

For drawing something specific I first need to understand how exactly the colormap works, I'm looking at the source code of the busybox fbsplash command (https://github.com/mirror/busybox/blob/master/miscutils/fbsplash.c) The idea is to create a very simply EBU or SMPTE color bar drawing (like https://kfrn.github.io/smpte-colourbars/), this will also help identifying wrong configurations (like the red screen that seems related to wrong RGB/RGBA/ARGB settings).

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