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

bshift/pbr/models/breather.mdl/breather.mat

@@ -0,0 +1,32 @@
+
+{
+"for" "#models/breather/endcaps.mdl"
+//"basecolor_map" "endcaps.png"
+//"normal_map" "endcaps_normal.png"
+//"metal_map" "endcaps_metal.png"
+//"roughness_map" "endcaps_roughness.png"
+}
+
+{
+"for" "#models/breather/floorplate.mdl"
+//"basecolor_map" "floorplate.png"
+//"normal_map" "floorplate_normal.png"
+//"metal_map" "floorplate_metal.png"
+//"roughness_map" "floorplate_roughness.png"
+}
+
+{
+"for" "#models/breather/roundness.mdl"
+//"basecolor_map" "roundness.png"
+//"normal_map" "roundness_normal.png"
+//"metal_map" "roundness_metal.png"
+//"roughness_map" "roundness_roughness.png"
+}
+
+{
+"for" "#models/breather/wedge.mdl"
+//"basecolor_map" "wedge.png"
+//"normal_map" "wedge_normal.png"
+//"metal_map" "wedge_metal.png"
+//"roughness_map" "wedge_roughness.png"
+}