Pass CommandContext to commands

CommandContext is the carrier of dependencies.
Currently, it only carries a DropProvider, but
it will grow bit by bit as more static singletons
and other similar structures get refactored.

src/main/java/client/command/commands/gm1/GotoCommand.java

@@ -26,6 +26,7 @@ package client.command.commands.gm1;
 import client.Character;
 import client.Client;
 import client.command.Command;
+import client.command.CommandContext;
 import constants.game.GameConstants;
 import constants.id.NpcId;
 import server.maps.*;
@@ -73,7 +74,7 @@ public class GotoCommand extends Command {
     }
 
     @Override
-    public void execute(Client c, String[] params) {
+    public void execute(Client c, String[] params, CommandContext ctx) {
         Character player = c.getPlayer();
         if (params.length < 1) {
             String sendStr = "Syntax: #b@goto <map name>#k. Available areas:\r\n\r\n#rTowns:#k\r\n" + GOTO_TOWNS_INFO;