refactor: remove unnecessary Client#getSettings(), use Client#getVarps()

These two methods would return the same values for a majority (if not all) of the time. The backing
arrays for both of these are synchronized when the server sends the packet to set a varp value.

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

@@ -152,8 +152,6 @@ public interface Client extends GameEngine
 
 	int[][] getXteaKeys();
 
-	int[] getSettings();
-
 	int[] getVarps();
 
 	int getSetting(Setting setting);