Change color representation

Allow missing ARGB values (defaults to 1)
Allow Name+ARGB to easily overwrite some values

Output/Themes/Ambient/Screens/ScreenTest.xml

@@ -11,12 +11,10 @@
       <Video />
       <Skin />
       <Color>
-        <Color>
-          <R>0</R>
-          <G>0</G>
-          <B>0</B>
-          <A>1</A>
-        </Color>
+		<R>0</R>
+		<G>0</G>
+		<B>0</B>
+		<A>1</A>
       </Color>
     </Background>
   </Backgrounds>