Multisite: Fire the `ms_loaded` action after multisite's bootstrap has finished.

This allows code in `sunrise.php` and in core to know when multisite bootstrap is complete and when the `$current_site` and `$current_blog` globals are populated.

Fixes #37235.
Props flixos90.

Built from https://develop.svn.wordpress.org/trunk@37916


git-svn-id: http://core.svn.wordpress.org/trunk@37857 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-settings.php

@@ -104,3 +104,11 @@ if ( ! $current_blog instanceof WP_Site ) {
 
 // Define upload directory constants
 ms_upload_constants();
+
+/**
+ * Fires after the current site and network have been detected and loaded
+ * in multisite's bootstrap.
+ *
+ * @since 4.6.0
+ */
+do_action( 'ms_loaded' );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37915';
+$wp_version = '4.6-alpha-37916';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.