[temp] use this shit to test ttc format.

and notice that ttc might have the issue:
1. ttc is list of fonts, not single font. so might have multiple font family.
2. it might contains the format that cannot be parsed (not pure ttf file.)

osu.Game.Rulesets.Karaoke/IO/Stores/TtfGlyphStore.cs

@@ -56,6 +56,7 @@ public TtfGlyphStore(ResourceStore<byte[]> store, string assetName = null)
             Store = new ResourceStore<byte[]>(store);
 
             Store.AddExtension("ttf");
+            Store.AddExtension("ttc");
 
             AssetName = assetName;
 
@@ -73,8 +74,8 @@ public Task LoadFontAsync() => fontLoadTask ??= Task.Factory.StartNew(() =>
                 using (var s = Store.GetStream($@"{AssetName}"))
                 {
                     var fonts = new FontCollection();
-                    var fontFamily = fonts.Add(s);
-                    font = new Font(fontFamily, 1);
+                    var fontFamily = fonts.AddCollection(s, out var description).ToArray();
+                    font = new Font(fontFamily[0], 1);
                 }
 
                 completionSource.SetResult(font);