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/client/command/commands/gm6/WarpWorldCommand.java

@@ -55,7 +55,7 @@ public class WarpWorldCommand extends Command {
                 player.setSessionTransitionState();
                 player.setWorld(worldb);
                 player.saveCharToDB();//To set the new world :O (true because else 2 player instances are created, one in both worlds)
-                c.announce(PacketCreator.getChannelChange(InetAddress.getByName(socket[0]), Integer.parseInt(socket[1])));
+                c.sendPacket(PacketCreator.getChannelChange(InetAddress.getByName(socket[0]), Integer.parseInt(socket[1])));
             } catch (UnknownHostException | NumberFormatException ex) {
                 ex.printStackTrace();
                 player.message("Unexpected error when changing worlds, are you sure the world you are trying to warp to has the same amount of channels?");