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

valve/pbr/models/w_weaponbox.mdl/w_weaponbox.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "#models/w_weaponbox/itemc_chrome.mdl"
+//"basecolor_map" "itemc_chrome.png"
+//"normal_map" "itemc_chrome_normal.png"
+//"metal_map" "itemc_chrome_metal.png"
+//"roughness_map" "itemc_chrome_roughness.png"
+}
+
+{
+"for" "#models/w_weaponbox/itemtop.mdl"
+//"basecolor_map" "itemtop.png"
+//"normal_map" "itemtop_normal.png"
+//"metal_map" "itemtop_metal.png"
+//"roughness_map" "itemtop_roughness.png"
+}
+
+{
+"for" "#models/w_weaponbox/sidemap.mdl"
+//"basecolor_map" "sidemap.png"
+//"normal_map" "sidemap_normal.png"
+//"metal_map" "sidemap_metal.png"
+//"roughness_map" "sidemap_roughness.png"
+}