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/event/RescueGaga.js

@@ -102,7 +102,7 @@ function playerEntry(eim, player) {
         player.changeMap(map, map.getPortal(0));
 
         const PacketCreator = Java.type('tools.PacketCreator');
-        player.announce(PacketCreator.showEffect("event/space/start"));
+        player.sendPacket(PacketCreator.showEffect("event/space/start"));
         player.startMapEffect("Please rescue Gaga within the time limit.", 5120027);
 }