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/NoteActionHandler.java

@@ -41,7 +41,7 @@ public final class NoteActionHandler extends AbstractMaplePacketHandler {
             String message = slea.readMapleAsciiString();
             try {
                 if (c.getPlayer().getCashShop().isOpened()) {
-                    c.announce(PacketCreator.showCashInventory(c));
+                    c.sendPacket(PacketCreator.showCashInventory(c));
                 }
 
                 c.getPlayer().sendNote(charname, message, (byte) 1);