add array shadow and cube shadow samplers for hlsl
add array shadow and cube shadow samplers for hlsl

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