[BUGFIX] Use Promises in Recycler

Use Promise objects in Recycler to handle dependencies between multiple AJAX
requests. This drops the deprecated and blocking ``async: false`` setting.
Thus, the client side performance of the recycler is heavily increased.

Resolves: #70674
Releases: master
Change-Id: Idada49773e560793a6e8e1cc574b26a97d22c6ce
Reviewed-on: http://review.typo3.org/44039


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>