Set the maximum number of player on the server through the config.json (#1001)

* Show server status to three-party game launcher

* Set the maximum number of player on the server through the config.json

* modify the logical order and show the number of maxplayer to API /status/server

* Now even players who have token already cannot bypass the maxPlayer check

src/main/java/emu/grasscutter/utils/ConfigContainer.java

@@ -110,6 +110,7 @@ public class ConfigContainer {
     public static class Account {
         public boolean autoCreate = false;
         public String[] defaultPermissions = {};
+        public int maxPlayer = -1;
     }
 
     /* Server options. */