support autoloading for templates

similar to what is possible for plugins, templates can now autoload
namespaced classes, too. the namespace is
dokuwiki\template\<templatename>

first very simple attempt at implementing svg pagetools

todos:

* edit action (and maybe others) use different icons depending on state,
we can't rely on passing $post
* media details screen not a

first very simple attempt at implementing svg pagetools

todos:

* edit action (and maybe others) use different icons depending on state,
we can't rely on passing $post
* media details screen not adjusted, yet
* no RTL styles
* no focus/active styles
* the event needs to be adjusted (maybe throw it away and do a new one)
* some icons are not good (create = edit)
* possibly more

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changed embedSVG to inlineSVG and make it return contents

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

translation update

fix pass by reference bug identified by scrutinizer

$pagelog->getRevisions(-1, 1) cannot be passed to array_pop() as the
parameter $array expects a reference.

removed commented out code

remove unused code

do not deliver scripts to ie<9 fixes #1816

All script tags are now surrounded by conditional comments to tell
Internet Explorer 8 and lower to not even bother trying to load the
JavaScript.

replaced broken link with wayback archive. fixes #1814

typo fix

removed unneeded clearer

use lower case class names

improve admin styling

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

Revert "removed the no longer used admin PNG icons"

This reverts commit b8b60fdbcef5123b187a73a7031820d0ea6a12be.

The images are now to be seen as deprecated but will remain for a little
longer. Th

Revert "removed the no longer used admin PNG icons"

This reverts commit b8b60fdbcef5123b187a73a7031820d0ea6a12be.

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

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more cleanup in embedSVG

now comments and line breaks between tags are removed

misspelled foot

added table footer support to renderer

This allows plugins to easily render a <tfoot> element in a table, even
though it's not used in standard table syntax it makes sense to have it
available.

fixed access to wrong variable

removed deprecated Tar and Zip classes

old PHP versions can't calculate in the initialzing

removed the no longer used admin PNG icons

Adds proper styling for new Admin UI

added SVG icons for our admin actions

using icons from https://materialdesignicons.com/

increased the default limit for embedded SVGs to 2kb

more complex material design icons can be somewhat larger than 1kb

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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