Tweak the ambience/crosfade layer to fade in regardless of another sample being there

Fix music not being looped sometimes
Prevent channel less than 0 from being passed
Set up a new music display element with an attached music name, it displays a scrolling text of the currently playing music
Fix music packet processing issues
Make SFX slider responsible for all music channels besides 0 (actual music)

scrolltext.cpp code recipe was taken from https://stackoverflow.com/questions/10651514/text-scrolling-marquee-in-qlabel - thanks to leemes for that one, I only adapted it for newer C++ version and tweaked some stuff.

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