avoid double encoding of generated URLs

getLink() now no longer escapes ampersands - this is task of the code
producing the HTML. When using asHtmlLink(), buildAttributes() will take
care of the esc

avoid double encoding of generated URLs

getLink() now no longer escapes ampersands - this is task of the code
producing the HTML. When using asHtmlLink(), buildAttributes() will take
care of the escaping for you.

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fix do parameter of revisions type

more doc blocks for the menu system

remove unused $category property

use menu for site tools

this adds an option to print the menu without icons (as we do in the
dokuwiki template) but icons were added nontheless

use menu system for user tools

also adjusts styles and adds images

fixed icons for edit action

fixed typo

fix base dir for images

beginning of a complete refactoring of the menues

This is an attempt to:

* get rid of the super long, complex functions in in/template.php
* make it easy for plugin authors to add their own items t

beginning of a complete refactoring of the menues

This is an attempt to:

* get rid of the super long, complex functions in in/template.php
* make it easy for plugin authors to add their own items to any
of our menus, regardless of the used template
* continue the progress to make use of SVG in the menues

This takes a similar approach as my actionrefactor branch. Originially
I thought both refactorings could be done in one, merging the
functionality of DokuWiki actions and the menu items. However I couldn't
make it work. So instead we have two separate but similar things.
Maybe they can converge later on.

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