refactor(Search): refactor html_search into Ui/Search

This commit should be without functional changes.

Make security.png more descriptive

Access attempts to security.png are normally denied, so the name of the file will be more self-descriptive

fixed typo in function name

changed embedSVG to inlineSVG and make it return contents

This makes it more flexible to use on the expense of needing one echo
more.

typo fix

removed unneeded clearer

use lower case class names

improve admin styling

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

fixed access to wrong variable

Adds proper styling for new Admin UI

refactor Admin UI

This introduces a new dokuwiki\Ui namespace and refactors the Admin
screen into a Ui class. The ultimate goal is to split up the big,
complex functions in inc\html.php in better ma

refactor Admin UI

This introduces a new dokuwiki\Ui namespace and refactors the Admin
screen into a Ui class. The ultimate goal is to split up the big,
complex functions in inc\html.php in better maintainable classes in the
Ui namespace. This is the first go at it. Others function->class
conversions should follow.

This also switches the icons for our base admin plugins to inline SVG.
(files and styling not included, yet).

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