Refactor material parsing and loading

This should hopefully pave the way for usable module switching using B9PS

Distribution/GameData/ConformalDecals/Parts/decal-blank.cfg

@@ -47,24 +47,22 @@ PART
 
     decalFront = Decal-Front
     decalBack = Decal-Back
+    decalShader = ConformalDecals/Feature/Bumped
 
-    MATERIAL
+    useBaseNormal = false
+
+    TEXTURE
     {
-      shader = ConformalDecals/Feature/Bumped
+      name = _Decal
+      textureURL = ConformalDecals/Assets/Tortilla-diffuse
+      isMain = true
+    }
 
-      TEXTURE
-      {
-        name = _Decal
-        textureURL = ConformalDecals/Assets/Tortilla-diffuse
-        isMain = true
-      }
-
-      TEXTURE
-      {
-        name = _BumpMap
-        textureURL = ConformalDecals/Assets/Tortilla-normal
-        isNormalMap = true
-      }
+    TEXTURE
+    {
+      name = _BumpMap
+      textureURL = ConformalDecals/Assets/Tortilla-normal
+      isNormalMap = true
     }
   }
 }