remove combined {models,sprites}.mat, remove extra .mdl .spr exts

valve/pbr/models/w_gaussammo.mdl/w_gaussammo.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "#models/w_gaussammo/boxside.mdl"
+//"basecolor_map" "boxside.png"
+//"normal_map" "boxside_normal.png"
+//"metal_map" "boxside_metal.png"
+//"roughness_map" "boxside_roughness.png"
+}
+
+{
+"for" "#models/w_gaussammo/boxtop.mdl"
+//"basecolor_map" "boxtop.png"
+//"normal_map" "boxtop_normal.png"
+//"metal_map" "boxtop_metal.png"
+//"roughness_map" "boxtop_roughness.png"
+}
+
+{
+"for" "#models/w_gaussammo/hinge.mdl"
+//"basecolor_map" "hinge.png"
+//"normal_map" "hinge_normal.png"
+//"metal_map" "hinge_metal.png"
+//"roughness_map" "hinge_roughness.png"
+}