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

valve/pbr/models/w_isotopebox.mdl/w_isotopebox.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "#models/w_isotopebox/suitcase_front.mdl"
+//"basecolor_map" "suitcase_front.png"
+//"normal_map" "suitcase_front_normal.png"
+//"metal_map" "suitcase_front_metal.png"
+//"roughness_map" "suitcase_front_roughness.png"
+}
+
+{
+"for" "#models/w_isotopebox/suitcase_side.mdl"
+//"basecolor_map" "suitcase_side.png"
+//"normal_map" "suitcase_side_normal.png"
+//"metal_map" "suitcase_side_metal.png"
+//"roughness_map" "suitcase_side_roughness.png"
+}
+
+{
+"for" "#models/w_isotopebox/suitcase_top.mdl"
+//"basecolor_map" "suitcase_top.png"
+//"normal_map" "suitcase_top_normal.png"
+//"metal_map" "suitcase_top_metal.png"
+//"roughness_map" "suitcase_top_roughness.png"
+}