HFP-1942 Add crossorigin api call.

Update minor version of core since interface changes

h5p.classes.php

@@ -1773,7 +1773,7 @@ class H5PCore {
   
   public static $coreApi = array(
     'majorVersion' => 1,
-    'minorVersion' => 15
+    'minorVersion' => 16
   );
   public static $styles = array(
     'styles/h5p.css',

js/h5p.js

@@ -1938,6 +1938,16 @@ H5P.createTitle = function (rawTitle, maxLength) {
     }
   };
 
+  /**
+   * Get crossorigin option that is set for site. Usefull for setting crossorigin policy for elements.
+   *
+   * @returns {string|null} Returns the string that should be set as crossorigin policy for elements or null if
+   * no policy is set.
+   */
+  H5P.getCrossOrigin = function () {
+    return H5PIntegration.crossorigin ? H5PIntegration.crossorigin : null;
+  };
+
   /**
    * Async error handling.
    *