Move login screen to toolbar and update design (still not fully implemented).

# Conflicts:
#	osu.Game/Overlays/Options/General/LoginOptions.cs
#	osu.Game/Overlays/Toolbar/Toolbar.cs

osu.Game/OsuGame.cs

@@ -106,6 +106,8 @@ namespace osu.Game
             {
                 Depth = -3,
                 Position = new Vector2(0, Toolbar.HEIGHT),
+                Anchor = Anchor.TopRight,
+                Origin = Anchor.TopRight,
             }).Preload(this, overlayContent.Add);
 
             Dependencies.Cache(options);