Add minimum client version check code

minclientversion.php

@@ -0,0 +1,12 @@
+<?php
+
+/*
+ * Give the minimum allowed game client version.  The client should check on 
+ * startup and not continue if its version is less than the given version.
+ */
+
+require 'settings.php';
+header('Content-Type: application/json');
+header("Access-Control-Allow-Origin: *");
+
+echo json_encode(["status" => "OK", "version" => MIN_CLIENT_VERSION]);

settings.template.php

@@ -16,6 +16,8 @@ define("PDB_USER", "");
 define("PDB_PASS", "");
 define("PDB_CHARSET", "latin1");
 
+define("MIN_CLIENT_VERSION", "1.5.2");
+
 define("GEOCACHE_KEY", "");
 define("MUNZEE_KEY", "");
 define("MUNZEE_SECRET", "");