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

bshift/pbr/models/p_satchel.mdl/p_satchel.mat

@@ -0,0 +1,32 @@
+
+{
+"for" "#models/p_satchel/black.mdl"
+//"basecolor_map" "black.png"
+//"normal_map" "black_normal.png"
+//"metal_map" "black_metal.png"
+//"roughness_map" "black_roughness.png"
+}
+
+{
+"for" "#models/p_satchel/radioside.mdl"
+//"basecolor_map" "radioside.png"
+//"normal_map" "radioside_normal.png"
+//"metal_map" "radioside_metal.png"
+//"roughness_map" "radioside_roughness.png"
+}
+
+{
+"for" "#models/p_satchel/tag.mdl"
+//"basecolor_map" "tag.png"
+//"normal_map" "tag_normal.png"
+//"metal_map" "tag_metal.png"
+//"roughness_map" "tag_roughness.png"
+}
+
+{
+"for" "#models/p_satchel/wrldsatchel.mdl"
+//"basecolor_map" "wrldsatchel.png"
+//"normal_map" "wrldsatchel_normal.png"
+//"metal_map" "wrldsatchel_metal.png"
+//"roughness_map" "wrldsatchel_roughness.png"
+}