Enhance the sending message API

- Change sendGameMessage call to addGameMessage to allow sending messages with all supported fields
- Update chat message manager to support sending messages with all supported fields

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

@@ -204,8 +204,8 @@ public interface RSClient extends RSGameEngine, Client
 	@Import("worldList")
 	RSWorld[] getWorldList();
 
-	@Import("sendGameMessage")
-	void sendGameMessage(int var1, String var2, String var3);
+	@Import("addChatMessage")
+	void addChatMessage(int type, String name, String message, String sender);
 
 	@Override
 	@Import("getObjectDefinition")