added api to create and write to byte buffers

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

@@ -1,12 +1,37 @@
 package net.runelite.rs.api;
 
+import net.runelite.api.Buffer;
 import net.runelite.mapping.Import;
 
-public interface RSBuffer extends RSNode
+public interface RSBuffer extends Buffer, RSNode
 {
 	@Import("array")
 	byte[] getPayload();
 
 	@Import("offset")
 	int getOffset();
+
+	@Import("writeByte")
+	@Override
+	void writeByte(int var1);
+
+	@Import("writeShort")
+	@Override
+	void writeShort(int var1);
+
+	@Import("writeMedium")
+	@Override
+	void writeMedium(int var1);
+
+	@Import("writeInt")
+	@Override
+	void writeInt(int var1);
+
+	@Import("writeLong")
+	@Override
+	void writeLong(long var1);
+
+	@Import("writeStringCp1252NullTerminated")
+	@Override
+	void writeStringCp1252NullTerminated(String string);
 }

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

@@ -1395,4 +1395,7 @@ public interface RSClient extends RSGameEngine, Client
 	@Override
 	@Import("SpotAnimationDefinition_modelArchive")
 	AbstractArchive getSpotAnimationDefinition_modelArchive();
+
+	@Construct
+	RSBuffer createBuffer(byte[] bytes);
 }