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/gm0/UptimeCommand.java

@@ -25,6 +25,7 @@ package client.command.commands.gm0;
 
 import client.Client;
 import client.command.Command;
+import client.command.CommandContext;
 import net.server.Server;
 
 import static java.util.concurrent.TimeUnit.*;
@@ -35,7 +36,7 @@ public class UptimeCommand extends Command {
     }
 
     @Override
-    public void execute(Client c, String[] params) {
+    public void execute(Client c, String[] params, CommandContext ctx) {
         long milliseconds = System.currentTimeMillis() - Server.uptime;
         int seconds = (int) (milliseconds / SECONDS.toMillis(1)) % 60;
         int minutes = (int) ((milliseconds / MINUTES.toMillis(1)) % 60);