It was deprecated in Twig 1.x and removed in 2.0.

This introduces the following:

- The use of Request objects to handle request data to controllers.
- The use of Response objects to model responses that should be sent to the browser.
- The use of "controllers" that are responsible for translating a request into a response.
- The possibility to define your own URLs on each module by specifying them, together with their controllers, in a "routes.yaml" file in the root of a module.
- The new UI is completely separated from the old, so "usenewui" must be set to "true" in the configuration.
- Twigified templates are not used unless we're using the new UI, or the twig template is part of a theme.

Add logoff button for admin-interface

This means we can remove the crystal_project icons when removing
the old templates.

Closes: #952

There's some redundancy now since the code must support the old
and new template. The links variety is not very beautiful, but the
old one wasn't either..

Also search for "en" as a final fallback language to find a displayable
name should such a name not be found in the current language and the
default language.

When we remove old templates we can also remove silk.

The former is no longer online.

There's a link straight above to the docs, a link to the rest
of the website in the footer, this paragraph is highly redundant.
It links to rnd.feide.no which is down.

This is likely way more informative for the average person
clicking the link - and linking directly to github only
stimulates people asking help questions in issue tracker.

Fix new UI

Do not enable complementary functionality by default

In the ldap-code, search.attributes can be either a string (single attribute) or an array of attributes... The negotiate attr-setting is equal to search.attributes, but was handled differently (as merely a string)

PasswordProtectedTransport authncontext when HTTPS