Added tileCache
Slopes and Diagonals can be rendered
Merge branch 'master' of https://github.com/Kajakklubben/gta2-webgl
Merge branch 'master' of https://github.com/Kajakklubben/gta2-webgl
Merge branch 'master' of https://github.com/Kajakklubben/gta2-webgl