Add user_get_session_timeout function to return the session timeout as a
unix timestamp.

Don't renew the user session if user_find is called. This is currently
the case for all http requests with required user authentication.

When calling user_find avoid comparing against NULL string.

Add a http post gmp cmd to renew the user sesssion.

The promise returned by gmp.user.renewSession() returns a moment date
when the user session ends.

They aren't used in GSA so we should removed the params from the
response. In future the params parameter should be removed too.

Using moment from our own module allows to use the imported
translations.

Return the session timeout in every response containing an envelope.

Every post request should be triggerd by user interaction. Therefore the
user session should be extended on such requests.

Add reducer, selector and action for putting the session timeout into
the redux store.

We don't need to dispatch actions if the variables are not defined.

Initialize the sessionTimeout in the store after a successful login.

The SessionObserver component is responsibe to renew the use session if
the user changes the location and to initalize the session timeout in
the store for reloads.

The function calls the gmp api to renew the users session in the backend
and updates the session timeout in the store on success.

Clarify the unit of the wait parameter.

Comparing the location object for identity isn't enough. The session
should only be renewed if the current page has changed. This is the case
if the pathname or the query parameters have changed.

There are still some interactions missing which should renew the session
on specific list pages like opening the create and edit dialogs (or the
task wizards).

This also removes the withUserName HOC from Titlebar.

This avoids clearing the store before the components are unmounted
because gmp.logout will call all logout listeners which will clear the
store in app.js.

Setting the autorefresh interval to zero should deactivate the timers.

Don't use componentWillMount anymore. This api is deprecated.

Don't handle renewing the session on successfull changing data. This
will be done at the containers.

Ensure gmp.isLoggedIn return false before the location is changed.

Renew session if the entity or corresponding data (like references tags)
have changed.