- 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)

Makefile

@@ -1423,6 +1423,7 @@ Q3OBJ = \
   $(B)/client/tr_image_tga.o \
   $(B)/client/tr_image_pcx.o \
   $(B)/client/tr_init.o \
+  $(B)/client/tr_model_iqm.o \
   $(B)/client/tr_light.o \
   $(B)/client/tr_main.o \
   $(B)/client/tr_marks.o \