Added compute fetch and ** atomic operations.
Added compute fetch and ** atomic operations.

attilaz/bgfx,septag/bgfx,MikePopoloski/bgfx,jpcy/bgfx,emoon/bgfx,jdryg/bgfx,bkaradzic/bgfx,septag/bgfx,LWJGL-CI/bgfx,LWJGL-CI/bgfx,emoon/bgfx,mendsley/bgfx,emoon/bgfx,MikePopoloski/bgfx,jdryg/bgfx,LWJGL-CI/bgfx,fluffyfreak/bgfx,jpcy/bgfx,bkaradzic/bgfx,bkaradzic/bgfx,jpcy/bgfx,attilaz/bgfx,jdryg/bgfx,fluffyfreak/bgfx,attilaz/bgfx,jdryg/bgfx,fluffyfreak/bgfx,septag/bgfx,jpcy/bgfx,LWJGL-CI/bgfx,bkaradzic/bgfx,MikePopoloski/bgfx,mendsley/bgfx,mendsley/bgfx,fluffyfreak/bgfx