overgrowth a210

New arena modeMajor optimizations like instancing and z-prepassOption for simplified shadow rendering to greatly improve performance on slower GPUCan enable and disable mods from different folders, instead of having to overwrite game dataPost processing including color grading and HDR bloomGlobal illumination through tetrahedral light probe meshUpdated renderer from OpenGL 2.2 to 3.2 coreScript improvements (dictionary support, script fragments, etc)Fixed arena crash bug (usually when a level ends in which weapons were used)Command line flags to load specific levels or alter config