Bugfixes - Improvement of mission generation

The crash mission and mission in pre-alpha were blurred. In alpha, the
lines between "Mission" (the engine) and the "Crash mission" are clearly
defined. Just debugging the new layout-generation mechanism.

It's pretty, and makes the layouts of missions look much more dynamic
than before. I know I could have released many dayz.. (dayz.. get it?)
before now, but I'm a bit of a perfectionist, and I am making ZFM for my
own use too.

So, stay frosty, ZFM is coming, and it'll make big changes to DayZ,
promise <3