Fixes bug where selection text and ammo graphic would disappear on failed unload
further work on optimized scaler routines

added 32-bit version of the functions; they're almost as good as the 64 ones!
tweaked 64-bit x4 scaler to reduce register spills, mostly unsuccessfully
- Fixed not loading MIDIs properly.
- Fixed no error when audio files are missing.
- Fixed audio file priority (no longer need to delete GM.CAT).
- Fixed "mute" setting causing crashes.
WIP Controls stuff.
- Fixed used hangars miscounting crafts in production.
- Fixed misleading function name.
Fix map view of desert hills
Fix hidden aliens on top of slopes in map
Merge branch 'master' of https://github.com/SupSuper/OpenXcom
bin/data/Language/Polish.lng
fixing compilation errors on Linux

directory and file names are case sensitive!
std::cerr requires an #include
fixing compilation errors on Linux

directory and file names are case sensitive!
std::cerr requires an #include
Merge pull request #273 from hmaon/seriously

fixing compilation errors on Linux
- Fixed not loading MIDIs properly.
- Fixed no error when audio files are missing.
- Fixed audio file priority (no longer need to delete GM.CAT).
- Fixed "mute" setting causing crashes.
WIP Controls stuff.
- Fixed used hangars miscounting crafts in production.
- Fixed misleading function name.
Fix map view of desert hills
Fix hidden aliens on top of slopes in map
fixing compilation errors on Linux

directory and file names are case sensitive!
std::cerr requires an #include
Merge remote-tracking branch 'upstream/master' into unloadTextFix
Merge pull request #272 from redx25/unloadTextFix

Minor inventory bug fix