Fix for footer buttons

- This will fix #103.
- We use `<pluginname>_before_footer()` instead of `<pluginname>_standard_footer_html`.
- Reference: https://tracker.moodle.org/browse/MDL-68564.
- See also: davosmith/moodle-navbuttons@f257bdc

lib.php

@@ -35,7 +35,7 @@
  *
  * @return string HTML footer content
  */
-function tool_moodlebox_standard_footer_html() {
+function tool_moodlebox_before_footer() {
 
     global $CFG;
 
@@ -72,7 +72,7 @@ function tool_moodlebox_standard_footer_html() {
             }
         }
 
-        $output = $restartshutdownform->render();
+        $output = html_writer::div($restartshutdownform->render(), "", array('id' => 'footerbuttons'));
 
         return $output;
     }

styles.css

@@ -66,3 +66,7 @@ input#id_shutdownbutton {
     border-color: rgba(189, 54, 47, 0.1) rgba(189, 54, 47, 0.1) rgba(128, 36, 32, 0.25);
     filter: progid:dximagetransform.microsoft.gradient(enabled = false);
 }
+
+#footerbuttons {
+    margin-top: 2rem;
+}

version.php

@@ -26,9 +26,9 @@
 
 $plugin = new stdClass();
 
-$plugin->version  = 2022042300;
-$plugin->release = '2.12.0';
+$plugin->version  = 2022080200;
+$plugin->release = '2.13.0-beta';
 $plugin->requires = 2018120300;
 $plugin->supported = [36, 400];
-$plugin->maturity = MATURITY_STABLE;
+$plugin->maturity = MATURITY_BETA;
 $plugin->component = 'tool_moodlebox';