Rework clanmanmode attack option hiding (#746)

* A whole bunch of refactoring

* Api/mixins/injector additions for hiding attack options

* Rework clanmanmode attack hiding

* Update Client.java

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

@@ -58,6 +58,8 @@ public interface RSPlayer extends RSActor, Player
 	@Override
 	boolean isFriend();
 
+	boolean isFriended();
+
 	@Import("headIconPrayer")
 	int getRsOverheadIcon();