Description: Sets the entityFX for the image's mesh
FX (can be added together) nS_FX_NONE = 0 nS_FX_FULLBRIGHT = 1 nS_FX_VERTEXCOLOR = 2 nS_FX_FLATSHADED = 4 nS_FX_DISABLEFOG = 8 nS_FX_DISABLEBACKFACECULLING = 16 nS_FX_FORCEALPHABLEND = 32