added two more missing action icons

added missing icon for register

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

menu SVGs now become proper part of core

all menu items should have a default SVG. Template authors then can
decide if they want to use them or not.

These are only the page tool SVGs. More need to

menu SVGs now become proper part of core

all menu items should have a default SVG. Template authors then can
decide if they want to use them or not.

These are only the page tool SVGs. More need to be added.

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