Rename and clean up MapleClient

src/main/java/client/command/commands/gm0/BuyBackCommand.java

@@ -23,7 +23,7 @@
 */
 package client.command.commands.gm0;
 
-import client.MapleClient;
+import client.Client;
 import client.command.Command;
 import client.processor.action.BuybackProcessor;
 
@@ -33,7 +33,7 @@ public class BuyBackCommand extends Command {
     }
     
     @Override
-    public void execute(MapleClient c, String[] params) {
+    public void execute(Client c, String[] params) {
         if (params.length < 1) {
             c.getPlayer().yellowMessage("Syntax: @buyback <info|now>");
             return;