Added xp tracker to overlay (#147)

* Added a split component to be able to put layout elements above eachother or next to eachother easily

* Modified xp tracker plugin to allow infoboxes to be added to canvas

* Formatted experience numbers using StackFormatter

* Cleaned up swing code as a suggestion in discord to use string states

* Forgot to initialize the menu item with the ADD_STATE

* Added final back to popupMenu

* Extracted duplicate enum Orientation from PanelComponent and SplitComponent into a seperate class named ComponentOrientation. Also changed the plugins that used the previous PanelComponent.Orientation to use ComponentOrientation

* Syntax and code convention fixes from deathbeams review

* Fixed a bug where logging into an other account did not reset the tracker overlay

* Removed useless methods and fixed some code convention issues

* fix

* fix

* fix2

* fix3

runelite-api/src/main/java/net/runelite/api/VarClientStr.java

@@ -34,6 +34,7 @@ import lombok.Getter;
 @Getter
 public enum VarClientStr
 {
+	DUEL_OPPONENT_NAME(357),
 	CHATBOX_TYPED_TEXT(335),
 	INPUT_TEXT(359),
 	PRIVATE_MESSAGE_TARGET(360),

runelite-api/src/main/java/net/runelite/api/VarPlayer.java

@@ -34,6 +34,7 @@ import lombok.Getter;
 @Getter
 public enum VarPlayer
 {
+	DUEL_PENDING(286),
 	ATTACK_STYLE(43),
 	QUEST_POINTS(101),
 	IS_POISONED(102),