add blank material files

valve/pbr/halflife.wad/+BUTTONLITE/+BUTTONLITE.mat

@@ -0,0 +1,16 @@
+
+{
+"for" "+0BUTTONLITE"
+//"basecolor_map" "+0BUTTONLITE.png"
+//"normal_map" "+0BUTTONLITE_normal.png"
+//"metal_map" "+0BUTTONLITE_metal.png"
+//"roughness_map" "+0BUTTONLITE_roughness.png"
+}
+
+{
+"for" "+ABUTTONLITE"
+//"basecolor_map" "+ABUTTONLITE.png"
+//"normal_map" "+ABUTTONLITE_normal.png"
+//"metal_map" "+ABUTTONLITE_metal.png"
+//"roughness_map" "+ABUTTONLITE_roughness.png"
+}