Fixed inconsistent handling of falsy values on fperm setting

The $conf['fperm'] value was checked in multiple files using different methods.
This can cause permission trouble with restricted environ

Fixed inconsistent handling of falsy values on fperm setting

The $conf['fperm'] value was checked in multiple files using different methods.
This can cause permission trouble with restricted environments, i.e. when chmod is forbidden and file permissions are non-default.
Now, all checks use implicit cast to boolean which leads to consistent behaviour.

Also, a misleading variable was renamed in context to better understand one of the checks.

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set action attribute for form tags

label.block design compatibility

render <br> after <input> tag inside <label class="block"> elements.
to be compatible with Doku_Form::form_textfield(), form_filefield()

fix bundled extension list

bugfix: not work enable/disable plugin buttons

rewrite code using Form\Form class

coding style

PSR-12 coding style

respect conf['target'] for Docs and Bugs links

fix #2912

better variable name

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Update de, de-informal

sort plugins in plugin_list()

Revert "eliminate access to global $plugin_controller"

This reverts commit 2b1bb8ffafe5d72c35b81659b1d96b8dc19f0de3.

eliminate access to global $plugin_controller

translation update

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fixed bug in extension cli when installing multiple plugins

replaced deprecated utf8 functions

For now this uses full qualified namespaces, sensible imports may come
later.

added filter to extension listing in CLI component

fix color for noninstalled extensions