Improved post-game memory cleanup
Documentaion - unit class
Start-up time ~25% faster by only updating the UI once per loadModeFile() call.
Merge remote-tracking branch 'upstream/master'
Able to hit and kill zombies with tank using the flamethrower weapon. Possible solution for github issue #67.
Hack to allow illegal resolutions of heightmap images (2 of 3 maps not playable otherwise).