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

bshift/pbr/models/gun_mag.mdl/gun_mag.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "#models/gun_mag/magazine_page1.mdl"
+//"basecolor_map" "magazine_page1.png"
+//"normal_map" "magazine_page1_normal.png"
+//"metal_map" "magazine_page1_metal.png"
+//"roughness_map" "magazine_page1_roughness.png"
+}
+
+{
+"for" "#models/gun_mag/magazine_page3.mdl"
+//"basecolor_map" "magazine_page3.png"
+//"normal_map" "magazine_page3_normal.png"
+//"metal_map" "magazine_page3_metal.png"
+//"roughness_map" "magazine_page3_roughness.png"
+}
+
+{
+"for" "#models/gun_mag/magazine_side.mdl"
+//"basecolor_map" "magazine_side.png"
+//"normal_map" "magazine_side_normal.png"
+//"metal_map" "magazine_side_metal.png"
+//"roughness_map" "magazine_side_roughness.png"
+}