Read UseSkinSprites when decoding storyboards

osu.Game/Beatmaps/Formats/LegacyStoryboardDecoder.cs

@@ -48,6 +48,10 @@ protected override void ParseLine(Storyboard storyboard, Section section, string
 
             switch (section)
             {
+                case Section.General:
+                    handleGeneral(storyboard, line);
+                    return;
+
                 case Section.Events:
                     handleEvents(line);
                     return;
@@ -60,6 +64,18 @@ protected override void ParseLine(Storyboard storyboard, Section section, string
             base.ParseLine(storyboard, section, line);
         }
 
+        private void handleGeneral(Storyboard storyboard, string line)
+        {
+            var pair = SplitKeyVal(line);
+
+            switch (pair.Key)
+            {
+                case "UseSkinSprites":
+                    storyboard.UseSkinSprites = pair.Value == "1";
+                    break;
+            }
+        }
+
         private void handleEvents(string line)
         {
             var depth = 0;

osu.Game/Storyboards/Storyboard.cs

@@ -15,6 +15,11 @@ public class Storyboard
 
         public BeatmapInfo BeatmapInfo = new BeatmapInfo();
 
+        /// <summary>
+        /// Whether the storyboard can fall back to skin sprites in case no matching storyboard sprites are found.
+        /// </summary>
+        public bool UseSkinSprites { get; set; }
+
         public bool HasDrawable => Layers.Any(l => l.Elements.Any(e => e.IsDrawable));
 
         public double FirstEventTime => Layers.Min(l => l.Elements.FirstOrDefault()?.StartTime ?? 0);