grandexchange: Shows the quantity you can buy on the GE WIP (#1042)

* Add measures to ensure positions of strings when togg:ling configItem

change method of gathering price per item

change math.round to math.floor, errors when certain numbers are rounded fix

* implement geBuilt script event, clear values when item isn't visible

* Update

* Update pos number

* Update

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

@@ -49,6 +49,11 @@ public enum Varbits
 	 */
 	CHAT_SCROLLBAR_ON_LEFT(6374),
 
+	/**
+	 * Grand Exchange
+	 */
+	GRAND_EXCHANGE_PRICE_PER_ITEM(4398),
+
 	/**
 	 * Runepouch
 	 */