Change color representation

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

VocaluxeLib/Menu/SongMenu/CSongMenu.cs

@@ -15,7 +15,6 @@
 // along with Vocaluxe. If not, see <http://www.gnu.org/licenses/>.
 #endregion
 
-using System.Xml;
 using VocaluxeLib.PartyModes;
 using VocaluxeLib.Xml;