Nightmare difficulty sprites + a options change (#219)

* Made song variations array optional (defaulting to empty)

* Add support for animated difficulties in Freeplay menu

* Disable funny music thing; disable flashing nightmare graphic when turned off

* Update assets folder

* assets update

---------

Co-authored-by: Cameron Taylor <cameron.taylor.ninja@gmail.com>

source/funkin/data/song/SongData.hx

@@ -281,6 +281,8 @@ class SongPlayData
   /**
    * The variations this song has. The associated metadata files should exist.
    */
+  @:default([])
+  @:optional
   public var songVariations:Array<String>;
 
   /**

source/funkin/data/song/migrator/SongData_v2_0_0.hx

@@ -81,6 +81,8 @@ class SongPlayData_v2_0_0
   // ==========
   // UNMODIFIED VALUES
   // ==========
+  @:default([])
+  @:optional
   public var songVariations:Array<String>;
   public var difficulties:Array<String>;
 

source/funkin/data/song/migrator/SongData_v2_1_0.hx

@@ -91,6 +91,8 @@ class SongPlayData_v2_1_0
   // ==========
   // UNMODIFIED VALUES
   // ==========
+  @:default([])
+  @:optional
   public var songVariations:Array<String>;
   public var difficulties:Array<String>;
   public var characters:SongData.SongCharacterData;

source/funkin/ui/freeplay/FreeplayState.hx

@@ -1206,6 +1206,15 @@ class DifficultySprite extends FlxSprite
 
     difficultyId = diffId;
 
-    loadGraphic(Paths.image('freeplay/freeplay' + diffId));
+    if (Assets.exists(Paths.file('images/freeplay/freeplay${diffId}.xml')))
+    {
+      this.frames = Paths.getSparrowAtlas('freeplay/freeplay${diffId}');
+      this.animation.addByPrefix('idle', 'idle0', 24, true);
+      if (Preferences.flashingLights) this.animation.play('idle');
+    }
+    else
+    {
+      this.loadGraphic(Paths.image('freeplay/freeplay' + diffId));
+    }
   }
 }

source/funkin/ui/story/StoryMenuState.hx

@@ -265,7 +265,7 @@ class StoryMenuState extends MusicBeatState
       {
         difficultySprite.frames = Paths.getSparrowAtlas('storymenu/difficulties/${diff}');
         difficultySprite.animation.addByPrefix('idle', 'idle0', 24, true);
-        difficultySprite.animation.play('idle');
+        if (Preferences.flashingLights) difficultySprite.animation.play('idle');
       }
       else
       {
@@ -484,7 +484,8 @@ class StoryMenuState extends MusicBeatState
     if (hasChanged)
     {
       buildDifficultySprite();
-      funnyMusicThing();
+      // Disable the funny music thing for now.
+      // funnyMusicThing();
     }
   }