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

src/main/java/net/server/handlers/CustomPacketHandler.java

@@ -30,7 +30,7 @@ public class CustomPacketHandler implements MaplePacketHandler {
     @Override
     public void handlePacket(SeekableLittleEndianAccessor slea, MapleClient c) {
         if (slea.available() > 0 && c.getGMLevel() == 4) {//w/e       
-            c.announce(PacketCreator.customPacket(slea.read((int) slea.available())));
+            c.sendPacket(PacketCreator.customPacket(slea.read((int) slea.available())));
         }
     }