RS-Client: Refactoring (also gradle compiler args) (#1236)

* gradle: compiler args for mixins/rs-client

* rs-client: yes

* rs-client: no

runescape-client/src/main/java/class267.java

@@ -1,10 +1,12 @@
+import net.runelite.mapping.Export;
 import net.runelite.mapping.ObfuscatedName;
 import net.runelite.mapping.ObfuscatedSignature;
 
 @ObfuscatedName("jn")
 public class class267 {
 	@ObfuscatedName("ai")
-	protected static boolean field3557;
+	@Export("hasFocus")
+	protected static boolean hasFocus;
 
 	@ObfuscatedName("jy")
 	@ObfuscatedSignature(