Add APP_NAME constant

Improved issue display
Add component::prepend
Add switches to form html
Updated form html to Bootstrap 5.
Updated navigation html to Bootstrap 5.

classes/issues.php

@@ -37,6 +37,9 @@ class Issues {
                     $child = [ $child ];
                 }
                 foreach ( $child as $children ) {
+                    if ( ! is_string( $children ) ) {
+                        $children = var_export( $children, true );
+                    }
                     $out .= '<li>' . $children . '</li>';
                 }
                 $out .= '</ul>';