add: Item Manager

src/SkinManagers/Generic/Skin.cs

@@ -0,0 +1,12 @@
+
+using Godot;
+
+namespace Polonium.SkinManagers.Generic;
+
+public abstract partial class Skin<TSkin> : Skin
+    where TSkin : Skin<TSkin>
+{
+    protected override int RootCount => PaletteRoots.Length;
+    protected override Color[] PaletteRoots => PoloniumRegistry.SkinRegistry<TSkin>.PaletteRoots;
+    protected override Dictionary<Color, Color[]> PaletteMap => PoloniumRegistry.SkinRegistry<TSkin>.PaletteMap;
+}