Fill in GlyphMetrics type

lime/text/GlyphMetrics.hx

@@ -1,15 +1,15 @@
 package lime.text;
 
-/**
- * ...
- * @author ...
- */
-class GlyphMetrics
-{
 
-	public function new() 
-	{
-		
-	}
+typedef GlyphMetrics = {
+	
+	var height:Int;
+	var horizontalAdvance:Int;
+	var horizontalBearingX:Int;
+	var horizontalBearingY:Int;
+	var index:Int;
+	var verticalAdvance:Int;
+	var verticalBearingX:Int;
+	var verticalBearingY:Int;
 	
 }