Create files from Grasscutter-Quests

these files are NOT directly compatible with Grasscutter, and require additional modifications to the codebase to work.

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

@@ -0,0 +1,72 @@
+package emu.grasscutter.command.commands;
+
+import emu.grasscutter.command.Command;
+import emu.grasscutter.command.CommandHandler;
+import emu.grasscutter.game.player.Player;
+import emu.grasscutter.game.world.SceneGroupInstance;
+
+import java.util.List;
+
+import static emu.grasscutter.utils.Language.translate;
+
+@Command(label = "group",
+         aliases = {"g"},
+         usage = {"(refresh) [<groupId>] [<suiteId>]"},
+         permission = "player.group",
+         permissionTargeted = "player.group.others")
+public final class GroupCommand implements CommandHandler {
+
+    @Override
+    public void execute(Player sender, Player targetPlayer, List<String> args) {
+        if (args.isEmpty()) {
+            return;
+        }
+        String cmd = args.remove(0).toLowerCase();
+
+        int groupId = 0;
+        int suiteId = 0;
+        switch (args.size()){
+            case 2:
+                try {
+                    suiteId = Integer.parseInt(args.get(1));
+                }
+                catch (Exception e) {
+                    CommandHandler.sendMessage(sender, translate(sender, "commands.group.invalid_suiteid"));
+                    return;
+                }  // Fallthrough
+            case 1:
+                try {
+                    groupId = Integer.parseInt(args.get(0));
+                }
+                catch (Exception e) {
+                    CommandHandler.sendMessage(sender, translate(sender, "commands.group.invalid_groupid"));
+                    return;
+                }
+                break;
+            default:
+                sendUsageMessage(sender);
+                return;
+        }
+
+        switch (cmd) {
+            case "refresh" -> {
+                SceneGroupInstance groupInstance = targetPlayer.getScene().getScriptManager().getGroupInstanceById(groupId);
+                if(groupInstance == null) {
+                    CommandHandler.sendMessage(sender, translate(sender, "commands.group.group_not_found", groupId));
+                    return;
+                }
+
+                if(args.size() >= 2) {
+                    targetPlayer.getScene().getScriptManager().refreshGroup(groupInstance, suiteId, false);
+                } else {
+                    targetPlayer.getScene().getScriptManager().refreshGroup(groupInstance);
+                }
+
+                CommandHandler.sendMessage(sender, translate(sender, "commands.group.refreshed", groupId));
+            }
+            default -> {
+                sendUsageMessage(sender);
+            }
+        }
+    }
+}