Mega Menus

[jacob-korf]

Closes #629.
Adds a mega menu that can be attached as a block in a menu link.
Entities -> CuBoulder/tiamat-custom-entities#157
Profile - > CuBoulder/tiamat10-profile#180
Template -> CuBoulder/tiamat10-project-template#51

[timurtripp]

I'm getting a JavaScript error and broken display of the menu on the mobile view (entire main navigation is missing)

[timurtripp]

Columns should be equal width and may need some margin/padding fixes

[timurtripp]

Revert the changes in region--primary-menu.html.twig and try to keep code spacing / indentation as consistent as possible throughout.

[timurtripp]

Clicking the menu item results in a # being appended to the page URL. The linked URL of the menu item should not change after being made a Mega Menu, but with a preventDefault() call stopping the browser from following the link on click.

[timurtripp]

Using the following malicious menu link title:

Highhelm Clans19');alert('successfully executed');void('

I'm able to execute arbitrary JavaScript. This is an XSS vulnerability. Please properly sanitize all user input before passing it into scripts.

[timurtripp]

On D7, clicking anywhere outside the mega menu hides it. That doesn't seem to work in this version.

[timurtripp]

Text color inside the mobile menu on my site is white-on-white and not legible.

[timurtripp]

Link href is still incorrectly altered by enabling mega menu – this time the attribute is gone completely.

[timurtripp]

The HTML title attribute you added isn't present on D7, isn't needed for accessibility, and should be removed.