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/3rdJob_mount.js

@@ -85,7 +85,7 @@ function playerEntry(eim, player) {
     em.setProperty("noEntry","true");
 
     const PacketCreator = Java.type('tools.PacketCreator');
-    player.getClient().announce(PacketCreator.getClock(eventTime * 60));
+    player.sendPacket(PacketCreator.getClock(eventTime * 60));
     eim.startEventTimer(eventTime * 60000);
 }