Update to 1.7.2a

Hey there- you might have been working on this yourself, but I managed to get 1.7.2a working in pixel-dungeon-gdx, with the only issue so far that I've run into being some glitches in the character selection screen. I figured I'd offer where I've managed to get to so far in case it's of any help :)

The commits are split into upstream 1.7.1c->1.7.2a diffs that patched without intervention, followed by the diffs I had to tweak things for each of the upstream commits, and my own additional changes that needed to be made to get things going which I attempted to separate by category (the removal of immersive mode for example).

Cheers!