Non-atomic commit with lots of Drupal 8 changes to blocks. Try out menu tree manipulator for core regression on impersonating user account.

Issue None by mfradcliffe: Add a note that you can create Bootstrap 3 navbars with footermap and bootstrap.

Issue None by mfradcliffe: Remove footermap-col class from footermap-header render as it is added later.

Issue None by mfradcliffe: Change use of deprecated theme function for templates. Change deprecated drupal_add_* to #attached behavior. Remove deprecated variables.

Issue None by mradcliffe: Fix to not display links without titles such as "metadata" or "contextual".

Issue None by mradcliffe: Improve semantic markup by using HTML5 nav element and changing behavior of menu header to be visually hidden instead of completely removed.

Add new Twig template and modifications necessary for it. Also figured out how to move things in Git.

Need to continue to use  DRUPAL_NO_CACHE, not DRUPAL_CACHE_CUSTOM. Also this whole Plugin may be removed because currently cannot disable footermap without the site borking.

Update footermap to use new Block Plugin system. Added an update script for the variables, but this may change later.

Fix CACHE_PERMANENT constant. This is really an object variable now, but going to change it to a constant value for now.