All packet creating methods now create Packet instead of byte[]

This commit got way too big...
- Remove deprecated methods for sending packets
- Favor OutPacket & Packet over MaplePacketLittleEndianWriter, LittleEndianWriter, and byte array
- Split up some packet creating methods into separate classes

scripts/npc/9000019.js

@@ -27,7 +27,7 @@ function action(mode, type, selection) {
                         }
 
                         const PacketCreator = Java.type('tools.PacketCreator');
-                        cm.getClient().announce(PacketCreator.openRPSNPC());
+                        cm.getClient().sendPacket(PacketCreator.openRPSNPC());
                         cm.dispose();
                 }
         }