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/server/events/gm/MapleOla.java

@@ -48,12 +48,12 @@ public class MapleOla {
 
        public void startOla() { // TODO: Messages
            chr.getMap().startEvent();
-           chr.getClient().announce(PacketCreator.getClock(360));
+           chr.sendPacket(PacketCreator.getClock(360));
            this.timeStarted = System.currentTimeMillis();
            this.time = 360000;
 
            chr.getMap().getPortal("join00").setPortalStatus(true);
-           chr.getClient().announce(PacketCreator.serverNotice(0, "The portal has now opened. Press the up arrow key at the portal to enter."));
+           chr.sendPacket(PacketCreator.serverNotice(0, "The portal has now opened. Press the up arrow key at the portal to enter."));
        }
 
         public boolean isTimerStarted() {