Add Noteskins

Added:
- Cel (classic)
- Metal (classic)
- Cyber (LightningXCE's)
- Enchantment
- Peter's Note
- Peter's Rainbow
- Peter's Vivid

Removed:
- All stock noteskins besides default

NoteSkins/dance/Note/Down Hold Explosion.lua

@@ -0,0 +1,14 @@
+local t = Def.ActorFrame {
+	Def.Sprite {
+		Texture=NOTESKIN:GetPath( '_down', 'Hold Explosion' );
+		Frame0000=0;
+		Delay0000=0.01;
+		Frame0001=1;
+		Delay0001=0.01;
+		Frame0002=2;
+		Delay0002=0.01;
+		Frame0003=3;
+		Delay0003=0.01;
+	};
+};
+return t;