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/channel/handlers/UseHammerHandler.java

@@ -32,6 +32,6 @@ import tools.data.input.SeekableLittleEndianAccessor;
  */
 public final class UseHammerHandler extends AbstractMaplePacketHandler {
     public final void handlePacket(SeekableLittleEndianAccessor slea, MapleClient c) {
-        c.announce(PacketCreator.sendHammerMessage());
+        c.sendPacket(PacketCreator.sendHammerMessage());
     }
 }