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

runescape-api/src/main/java/net/runelite/rs/api/RSWidget.java

@@ -485,4 +485,11 @@ public interface RSWidget extends Widget
 	@Import("onInvTransmit")
 	@Override
 	Object[] getOnInvTransmit();
+
+	@Import("containsMouse")
+	@Override
+	boolean containsMouse();
+
+	@Import("getSprite")
+	RSSprite getSprite(boolean b);
 }