Merge pull request #6310 from V1ntagezTV/add-random-intro

Add the ability to choose a random intro sequence each startup

osu.Game/Configuration/IntroSequence.cs

@@ -6,6 +6,7 @@ namespace osu.Game.Configuration
     public enum IntroSequence
     {
         Circles,
-        Triangles
+        Triangles,
+        Random
     }
 }

osu.Game/Screens/Loader.cs

@@ -6,6 +6,7 @@ using System.Linq;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shaders;
+using osu.Framework.MathUtils;
 using osu.Game.Screens.Menu;
 using osuTK;
 using osu.Framework.Screens;
@@ -59,6 +60,9 @@ namespace osu.Game.Screens
 
         private IntroScreen getIntroSequence()
         {
+            if (introSequence == IntroSequence.Random)
+                introSequence = (IntroSequence)RNG.Next(0, (int)IntroSequence.Random);
+
             switch (introSequence)
             {
                 case IntroSequence.Circles: