this fixes another problem with our tests and phpunit 6.1

This should fix some tests on PHP 7.1. The work is far from done, we
still have a lot of variables without proper accessibility defined.

* Updated remote.php

Updated remote.php for retrieving all the acl details.

* Updated remote.php

By mistake changed in addAcl instead of listAcls.

Those tests either just check that an exception is NOT thrown or are
there to check dependencies for other tests. Newer phpunits mark all
tests as risky that have no assertion.

squashed a whole bunch of PRs

closes #1907
closes #1908
closes #1909
closes #1910
closes #1911
closes #1912
closes #1913
closes #1914
closes #1915
closes #1916
closes #1917
closes #1918
closes #1919
closes #1920
closes #1921
closes #1922

The check did not work any more. see #1853

Add Event to modify the list of javascript files before they are processed. This allows plugins to not have their - or other plugins - script delivered to the client. Creating the list of files upfront might add a little overhead which I think is OK when you can be certain that only JavaScript that really is needed will be delivered to the client.

Multiple Javascript requests, e.g. to only send the jQuery part or just editor/administrator scripts, could be implemented with this modification (I know, jQuery has already been split).

When an svg has a fill attribute directly on the path, we need more
specifity to override it.

ran svgo over all the admin svg files to strip all unneeded cruft.

* use inline-block instead of flexbox
* fix RTL alignments

This reverts commit b8b60fdb.

The images are now to be seen as deprecated but will remain for a little
longer. They will be released in the future.