refactor: update update_checker to use new versioning system

Update checker now uses the local version.json file for checks.. Seems nicer this way.

Author: TGRHavoc

index.php

@@ -27,6 +27,8 @@
 	require_once("utils/params.php");
 	require_once("utils/update_checker.php");
 
+    Update::getCurrentVersion();
+
 	$config = Config::getConfig();
 	$parser = ParamParser::getParser();
 ?>

utils/update_checker.php

@@ -2,15 +2,23 @@
 
 class Update{
 
-    private static $version = "2.1.1";
-    private static $url = "https://gist.githubusercontent.com/TGRHavoc/581ec66730b7abafe49ab616db87b0bb/raw/f27c6f2573dd1df0692f97c78a73f5687d20f791/live_map.versions";
+    private static $version = "2.1.3";
+    private static $url = "https://raw.githubusercontent.com/TGRHavoc/live_map-interface/master/version.json";
 
     public static function latestVersion(){
         $data = file_get_contents(self::$url);
         $data = json_decode($data);
 
         return $data->interface == self::$version;
     }
+
+    public static function getCurrentVersion(){
+        $ver = file_get_contents("version.json") or die("Please contact the web admin. \"version.json\" doesn't exist! How am I supposed to check for updates?");
+        $ver = json_decode($ver);
+
+        self::$version = $ver->interface;
+    }
+
 }
 
 ?>

version.json

@@ -0,0 +1,3 @@
+{
+  "interface" : "2.1.3"
+}