coding style: control flow whitespaces

update some plugin classes in phpdocs, reformatting

coding style: function call spacing

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: function argument spacing

Apply rector renames

Apply remaining rector fixes to lib

Apply rector fixes to the rest of lib/plugin

Apply rector fixes to extension plugin

translation update

translation update

installing extensions needs to reset the opcache

translation update

translation update

translation update

Update core code to make use of sexplode()

This makes use of our own explode mechanism everywhere were we expect a
fixed number of results.

access plugin repository over SSL only

fixes #3677

translation update

translation update

translation update

translation update

check CSRF token enabling/disabling extensions. fixes #3559

much better greek (el) translations

adjust help text of extension cli

to reflect that extensions can be installed from URLs as well

Do not duplicate the foreach ($installed...