LCEMP RCE fixes

Based on commit d017bfc30a68888bf5c79b23cf5c4f607cf828bf

Minecraft.World/ContainerSetSlotPacket.cpp

@@ -35,7 +35,7 @@ void ContainerSetSlotPacket::read(DataInputStream *dis) //throws IOException
 	// 4J Stu - TU-1 hotfix
 	// Fix for #13142 - Holding down the A button on the furnace ingredient slot causes the UI to display incorrect item counts
 	BYTE byteId = dis->readByte();
-	containerId = *(char *)&byteId;
+    containerId = (char)(signed char)byteId;
 	slot = dis->readShort();
 	item = readItem(dis);
 }