Remove "Maple" prefix from packet handler names

src/main/java/net/server/handlers/login/SetGenderHandler.java

@@ -23,7 +23,7 @@
 package net.server.handlers.login;
 
 import client.MapleClient;
-import net.AbstractMaplePacketHandler;
+import net.AbstractPacketHandler;
 import net.packet.InPacket;
 import net.server.Server;
 import net.server.coordinator.session.SessionCoordinator;
@@ -33,7 +33,7 @@ import tools.PacketCreator;
  *
  * @author kevintjuh93
  */
-public class SetGenderHandler extends AbstractMaplePacketHandler {
+public class SetGenderHandler extends AbstractPacketHandler {
     @Override
     public void handlePacket(InPacket p, MapleClient c) {
         if (c.getGender() == 10) { //Packet shouldn't come if Gender isn't 10.