spellbook: bugfixes/improvements (#1427)

* Add InterfaceTab enum, remove duplicate varbit

* Add widget.containsMouse rs-api method, sort scriptids, add various wids

* Refactor/improve/fix spellbook

I even made everything I could final to please goban

* Fix bugs/cleanup/improvements

* Update SpellbookPlugin.java

runelite-mixins/src/main/java/net/runelite/mixins/WidgetSpriteMixin.java

@@ -3,6 +3,7 @@ package net.runelite.mixins;
 import net.runelite.api.Sprite;
 import java.util.Map;
 import net.runelite.api.mixins.Copy;
+import net.runelite.api.mixins.Inject;
 import net.runelite.api.mixins.Mixin;
 import net.runelite.api.mixins.Replace;
 import net.runelite.api.mixins.Shadow;
@@ -36,4 +37,11 @@ public abstract class WidgetSpriteMixin implements RSWidget
 
 		return rs$getWidgetSprite(var1);
 	}
+
+	@Inject
+	@Override
+	public Sprite getSprite()
+	{
+		return getSprite(false);
+	}
 }