Implement HitCircleFont skin configuration

osu.Game/Skinning/LegacySkin.cs

@@ -57,8 +57,7 @@ namespace osu.Game.Skinning
                     componentName = "hit300";
                     break;
                 case "Play/osu/number-text":
-                    // Todo: Not necessarily default font
-                    return hasFont("default") ? new LegacySpriteText(Textures, "default") : null;
+                    return hasFont(Configuration.HitCircleFont) ? new LegacySpriteText(Textures, Configuration.HitCircleFont) : null;
             }
 
             var texture = GetTexture(componentName);

osu.Game/Skinning/LegacySkinDecoder.cs

@@ -19,6 +19,7 @@ namespace osu.Game.Skinning
             switch (section)
             {
                 case Section.General:
+                {
                     var pair = SplitKeyVal(line);
 
                     switch (pair.Key)
@@ -32,6 +33,20 @@ namespace osu.Game.Skinning
                     }
 
                     break;
+                }
+                case Section.Fonts:
+                {
+                    var pair = SplitKeyVal(line);
+
+                    switch (pair.Key)
+                    {
+                        case "HitCirclePrefix":
+                            skin.HitCircleFont = pair.Value;
+                            break;
+                    }
+
+                    break;
+                }
             }
 
             base.ParseLine(skin, section, line);

osu.Game/Skinning/SkinConfiguration.cs

@@ -14,5 +14,7 @@ namespace osu.Game.Skinning
         public List<Color4> ComboColours { get; set; } = new List<Color4>();
 
         public Dictionary<string, Color4> CustomColours { get; set; } = new Dictionary<string, Color4>();
+
+        public string HitCircleFont { get; set; } = "default";
     }
 }