MDL-37009 Display courses and categories tree on /course/index.php using new renderer

Also /course/category.php
MDL-38304 moved editing functionality from course/search.php to course/manage.php
MDL-37009 Display course search results using new renderer methods
MDL-37009 Display list of tagged courses using new renderer
MDL-37009 new course listings: changes to base, standard and afterburner themes
MDL-37009 new course listings: changes to canvas and other themes:

canvas-based themes: formal_white, magazine, splash
MDL-37009 Use new renderers for frontpage course and category listings
EXPERIMENTAL: add 'can-access-course' class to accessible courses