Big Performance Update

- big performance improvements - general grafic updates - implemented different mesh LOD levels - reworked collision and optic of level 1 - fixed a bug where the game crashed while loading level 4 - some minor bugfixes [url=http://cdn.akamai.steamstatic.com/steamcommunity/public/images/clans/26009265/e06ef323c39d89fc95d2aa2c23d815c77c963243.jpg][img]http://cdn.akamai.steamstatic.com/steamcommunity/public/images/clans/26009265/4c05fa21aee85fcee95b79abdbd27ce312b0f39a.jpg[/img][/url]