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

valve/pbr/models/w_357ammobox.mdl/w_357ammobox.mat

@@ -0,0 +1,32 @@
+
+{
+"for" "#models/w_357ammobox/boxart1.mdl"
+//"basecolor_map" "boxart1.png"
+//"normal_map" "boxart1_normal.png"
+//"metal_map" "boxart1_metal.png"
+//"roughness_map" "boxart1_roughness.png"
+}
+
+{
+"for" "#models/w_357ammobox/boxart2.mdl"
+//"basecolor_map" "boxart2.png"
+//"normal_map" "boxart2_normal.png"
+//"metal_map" "boxart2_metal.png"
+//"roughness_map" "boxart2_roughness.png"
+}
+
+{
+"for" "#models/w_357ammobox/bulletCHROME.mdl"
+//"basecolor_map" "bulletCHROME.png"
+//"normal_map" "bulletCHROME_normal.png"
+//"metal_map" "bulletCHROME_metal.png"
+//"roughness_map" "bulletCHROME_roughness.png"
+}
+
+{
+"for" "#models/w_357ammobox/cardboard.mdl"
+//"basecolor_map" "cardboard.png"
+//"normal_map" "cardboard_normal.png"
+//"metal_map" "cardboard_metal.png"
+//"roughness_map" "cardboard_roughness.png"
+}