Bug fixes

Fixes the path of subtheme for auto libraries inclusion, button component improvements and better SASS handling

Fixed bug where custom twig template was applied when it should not have been, for example on the login page.
Improved and simplified how it checks if current page is admin page.

Bug fix:

• #3098719: Undefined variable context_options by JoshaHubbers

upgrading Revechat API and updating documentation for drupal 8.x

upgrading Revechat API and updating documentation for durpal 7.x