updated rector and applied it

Use str_starts_with/str_ends_with

remove debug, fix codesniffer

use $auth instanceof AuthPlugin instead of not null check

unused items, phpdocs

code style: line breaks

code style: operator spacing

code style: control structure fixes

code style: indent fixes

coding style: control flow line breaks

coding style: control flow whitespaces

coding style: function call spacing

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: function argument spacing

Apply rector fixes to the rest of inc

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.

remove jQuery Migrate as outlined in #1546

First go at moving the plugin classes into their own namespace

line lengths shortened

This makes sure all files use line lenghts shorter than 120 characters.

This is a quick fix. It might not always be the nicest change.

fix: drop JSON error handling

This isn't really the best place for that error handling.

refactor: move manifest functions to more intuitive places

replace conditional with array_pad

This should reduce the complexity of the function

fix: set default value for empty var

If an config value is not set in the input lines, initialize it as empty
string to prevent PHP Notices complaining about $line[1] being not set.

I supplemented the existing comments on the methods in which there was not enough information to the standard phpDoc.

I supplemented the existing comments on the methods in which there was not enough information to the standard phpDoc.