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

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

@@ -40,7 +40,7 @@ public interface Client extends GameEngine
 
 	int getRealSkillLevel(Skill skill);
 
-	void sendGameMessage(ChatMessageType type, String message);
+	void addChatMessage(ChatMessageType type, String name, String message, String sender);
 
 	GameState getGameState();
 

runelite-api/src/main/java/net/runelite/api/events/ChatMessage.java

@@ -33,7 +33,7 @@ import net.runelite.api.ChatMessageType;
 public class ChatMessage
 {
 	private ChatMessageType type;
-	private String sender;
+	private String name;
 	private String message;
-	private String clan;
+	private String sender;
 }