Adds anti-aliasing option with FXAA algorithm.
Differential Revision: https://code.wildfiregames.com/D2537
Hmm, is it intended, that FXAA is not used on maps with PostEffect to default even when I enabled FXAA in the options?
Is not intended. I already knew about this side effect but forgot to mention it :(. The problem lies with the scenario and skirmish maps that have the post-effects as opt-in not opt-out given you need to include them to xml map data description.