LL-847 #close Resolved by making elements really hidden.

Added a class to be added to all the hidden widgets. The current
impementation makes the elements really hidden, the issue of the
timeline not being drawn correctly is resolved by calling a force redraw
on currently selected Episode Timeline.
LL-859 #close Added explicit redirect_uri.

Added explicit redirect_uri to OIDC login procedure. This way it will be
possible to configure one client with multiple Redirect URIs and thus
have multiple endpoints reusing the same client.
Merge pull request #6 from learning-layers/integration

Integration