- 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_main.c

@@ -1259,6 +1259,9 @@ void R_AddEntitySurfaces (void) {
 					R_MDRAddAnimSurfaces( ent );
 					break;
 #endif
+				case MOD_IQM:
+                                        R_AddIQMSurfaces( ent );
+                                        break;
 				case MOD_BRUSH:
 					R_AddBrushModelSurfaces( ent );
 					break;