Remove some mentions of "lazer"

I am aware there are more throughout the codebase but intentionally left
the remaining mentioned for one reason or another. The intention here is
to mainly change user-facing versioning to change the positioning of the
"lazer" term (to be where we would expect "cuttingedge" or "beta" to
be).

osu.Game/Skinning/LegacyColourCompatibility.cs

@@ -7,7 +7,7 @@ using osuTK.Graphics;
 namespace osu.Game.Skinning
 {
     /// <summary>
-    /// Compatibility methods to convert osu!stable colours to osu!lazer-compatible ones. Should be used for legacy skins only.
+    /// Compatibility methods to apply osu!stable quirks to colours. Should be used for legacy skins only.
     /// </summary>
     public static class LegacyColourCompatibility
     {

osu.Game/Skinning/SkinInfo.cs

@@ -46,7 +46,7 @@ namespace osu.Game.Skinning
         public static SkinInfo Default { get; } = new SkinInfo
         {
             ID = DEFAULT_SKIN,
-            Name = "osu!lazer",
+            Name = "osu! (triangles)",
             Creator = "team osu!",
             InstantiationInfo = typeof(DefaultSkin).GetInvariantInstantiationInfo()
         };