Generate/Clean Map in Edit- and Runtime-Mode by Button

Hey, the BSP level can now be generated normally at runtime, in Edit Mode or in Runtime Mode. :-D

Preview: http://killtube.org/downloads/unity3d/uquake3.jpg

![uquake3](https://cloud.githubusercontent.com/assets/5236548/3668484/89ce2ee6-121d-11e4-8648-079b49d56957.jpg)