Hedgewars.png had a resolution more than twice as high as required; also fixed some (mostly obsolete) code that also contained a typo that would cause a warning/note in clang
move sdlmain_osx aside in its own folder so its include path is not contaminated
backout a few commits that desyncronized translations and broke physfs on 32 bit
fix
issue #664 ("Quick game will fail if the randomly chosen theme is a DLC/custom one")