Rename and clean up MapleClient

src/main/java/net/server/channel/handlers/ItemPickupHandler.java

@@ -22,7 +22,7 @@
 package net.server.channel.handlers;
 
 import client.Character;
-import client.MapleClient;
+import client.Client;
 import net.AbstractPacketHandler;
 import net.packet.InPacket;
 import server.maps.MapleMapObject;
@@ -38,7 +38,7 @@ import java.awt.*;
 public final class ItemPickupHandler extends AbstractPacketHandler {
 
     @Override
-    public final void handlePacket(final InPacket p, final MapleClient c) {
+    public final void handlePacket(final InPacket p, final Client c) {
         p.readInt(); //Timestamp
         p.readByte();
         p.readPos(); //cpos