api: add method to remove MessageNodes

Co-authored-by: trimbe <benno.tremback@gmail.com>

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

@@ -24,6 +24,10 @@
  */
 package net.runelite.rs.api;
 
+import net.runelite.mapping.Import;
+
 public interface RSCacheableNode extends RSNode
 {
+	@Import("unlinkDual")
+	void unlinkDual();
 }

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

@@ -39,4 +39,7 @@ public interface RSChatLineBuffer extends ChatLineBuffer
 	@Import("length")
 	@Override
 	int getLength();
+
+	@Import("length")
+	void setLength(int length);
 }