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/gm2/ClearSlotCommand.java

@@ -26,6 +26,7 @@ package client.command.commands.gm2;
 import client.Character;
 import client.Client;
 import client.command.Command;
+import client.command.CommandContext;
 import client.inventory.InventoryType;
 import client.inventory.Item;
 import client.inventory.manipulator.InventoryManipulator;
@@ -36,7 +37,7 @@ public class ClearSlotCommand 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) {
             player.yellowMessage("Syntax: !clearslot <all, equip, use, setup, etc or cash.>");