Rewrite commands

Signed-off-by: Jaida Wu <mlgmxyysd@meowcat.org>

src/main/java/emu/grasscutter/command/commands/GodMode.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.command.commands;
+
+import emu.grasscutter.command.Command;
+import emu.grasscutter.command.CommandHandler;
+import emu.grasscutter.game.GenshinPlayer;
+
+import java.util.List;
+
+@Command(label = "godmode", usage = "godmode [playerId]",
+        description = "Prevents you from taking damage", permission = "player.godmode")
+public class GodMode implements CommandHandler {
+
+    @Override
+    public void onCommand(GenshinPlayer sender, List<String> args) {
+        if (sender == null) {
+            CommandHandler.sendMessage(null, "Run this command in-game.");
+            return; // TODO: toggle player's godmode statue from console or other players
+        }
+        sender.setGodmode(!sender.inGodmode());
+        sender.dropMessage("Godmode is now " + (sender.inGodmode() ? "enabled" : "disabled") + ".");
+    }
+}