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

valve/pbr/models/p_shotgun.mdl/p_shotgun.mat

@@ -0,0 +1,32 @@
+
+{
+"for" "#models/p_shotgun/shotdark.mdl"
+//"basecolor_map" "shotdark.png"
+//"normal_map" "shotdark_normal.png"
+//"metal_map" "shotdark_metal.png"
+//"roughness_map" "shotdark_roughness.png"
+}
+
+{
+"for" "#models/p_shotgun/shothole.mdl"
+//"basecolor_map" "shothole.png"
+//"normal_map" "shothole_normal.png"
+//"metal_map" "shothole_metal.png"
+//"roughness_map" "shothole_roughness.png"
+}
+
+{
+"for" "#models/p_shotgun/shotside.mdl"
+//"basecolor_map" "shotside.png"
+//"normal_map" "shotside_normal.png"
+//"metal_map" "shotside_metal.png"
+//"roughness_map" "shotside_roughness.png"
+}
+
+{
+"for" "#models/p_shotgun/shottop.mdl"
+//"basecolor_map" "shottop.png"
+//"normal_map" "shottop_normal.png"
+//"metal_map" "shottop_metal.png"
+//"roughness_map" "shottop_roughness.png"
+}