In this commit we add support for some tags which are also called void-elements according to http://w3c.github.io/html/syntax.html#void-elements to be parsed by our template parser and get tagged as singleton_html_tags. Fixes: #8387.
This changes all of the old bootstrap .btn buttons in the settings UI to the new .button classes that they should be.
Rename `admin-alias-list.handlebars` to `admin-realm-domains-list.handlebars`. Fixes: #3145.
Aditya Bansal
Brock Whittaker
Harshit Bansal