Improve layer documentation on wiki
I think a map maker spends as much time wondering about the layers as the time one could write the documentation about the layers. There are a lot of layers, so it seems like a lot is possible with layers, so a map maker spends a lot of time trying to research about the layers, which is a waste of time for a map maker. Also the layer names are not accurate, so a documentation would be nice. "Terrain2". Then the "IgnoreBullet" ignores bullets, but also throwables, explosions and your gun when ads.
