[!!!][TASK] Use progress bar instead of mask for loading

The core currently has two places where a loading
indicator is shown:

* Loading iframes, using a mask created by ExtJS
* Loading IRRE elements via AJAX, hand-made for IRRE

This behaviour should be unified with a new and clean API
using the JS library nprogress (MIT license).

Some old CSS code can safely removed, as it is not
used anymore.

Releases: master
Resolves: #64035
Change-Id: Iaf45af96aa022571195d1a27cfaa9dfd0f4ad63a
Reviewed-on: http://review.typo3.org/34242
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>
[BUGFIX] Typo3DbQueryParser: Use IN with array-operand2

When passing an array for a "contains"-comparison
Typo3DbQueryParser generates SQL like
[...] WHERE uid_local='1','3' [...]
which simply needs an "IN" statement for the operand2.

Change-Id: Id3a6e73dcbd55d46a5279037b156f604dafa9888
Resolves: #63275
Releases: master, 6.2
Reviewed-on: http://review.typo3.org/34514
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
[FOLLOW-UP] Rename rst file

Add missing file extension to rst file.

Resolves: #58929
Releases: master
Change-Id: I39e9286914eb92db70dfd68bcd837b9fe0183f2f
Reviewed-on: http://review.typo3.org/35647
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
Revert "[BUGFIX] Typo3DbQueryParser: Use IN with array-operand2"

Reverts: #63275
Resolves: #64044
Related: #7848

This reverts commit e235c9ad8b32267ece98d843a43daeab430db235.

Change-Id: I71a134469b9b44f892ad13be52d828ca653c03f1
Reviewed-on: http://review.typo3.org/35648
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Tested-by: Helmut Hummel <helmut.hummel@typo3.org>