TinyMCE: update to 4.6.0. Has many new features and bug fixes, changelog: https://www.tinymce.com/docs/changelog/#version460-may42017.

Fixes #40690.
Built from https://develop.svn.wordpress.org/trunk@40583


git-svn-id: http://core.svn.wordpress.org/trunk@40453 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40582';
+$wp_version = '4.8-alpha-40583';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
@@ -18,7 +18,7 @@ $wp_db_version = 38590;
  *
  * @global string $tinymce_version
  */
-$tinymce_version = '4506-20170408';
+$tinymce_version = '4600-20170506';
 
 /**
  * Holds the required PHP version