- Add Inter-Quake Model (IQM) Format support, patch by gimhael with minor modifications by myself (#4965)

- Changed model_t::md4 to model_t::modelData
- Fix R_ModelBounds for MD4, MDR and IQM models (#4966)
- Support Model format fallback similar to image formats in tr_image.c, patch by Zack Middleton (#4967)

code/renderer/tr_surface.c

@@ -1242,6 +1242,7 @@ void (*rb_surfaceTable[SF_NUM_SURFACE_TYPES])( void *) = {
 #ifdef RAVENMD4
 	(void(*)(void*))RB_MDRSurfaceAnim,		// SF_MDR,
 #endif
+	(void(*)(void*))RB_IQMSurfaceAnim,		// SF_IQM,
 	(void(*)(void*))RB_SurfaceFlare,		// SF_FLARE,
 	(void(*)(void*))RB_SurfaceEntity,		// SF_ENTITY
 	(void(*)(void*))RB_SurfaceDisplayList		// SF_DISPLAY_LIST