CRM-20776 - Navigation - Fix menu items with mix of #, ?, &

CRM-20776 - Navigation - Fix menu items with mix of #, ?, &

== Use case

 * Use an extension to implement `hook_civicrm_navigationMenu`.
 * Add or edit the URL of a menu item to use a mix of URL control chars -- eg `civicrm/case/a/#/case?dtab=0&dme=0`
 * Look in the CiviCRM navigation bar and see the final URL of the link.

== Before

 * The URL is munged (eg `http://dcase.l/civicrm/case/a/?dtab=0&dme=0#/case`)

== After

 * The URL appears consistent (eg `http://dcase.l/civicrm/case/a/#/case?dtab=0&dme=0`)

== Testing

 * On Drupal 7, I activated all components (CiviContribute, CiviMail, etal) to build a large pool of menu items.
   Then I grabbed the menu content (eg `http://dcase.l/civicrm/ajax/menujs/202/en_US/1/abcd1234`) -- both with and
   without the patch. The content was the same, except for the intended items.
 * Repeated above on WordPress (which does not use clean URLs).