Flask-Login improvements

[danricho]

My main thoughts on this one are:

• Add a 'Remember me' checkbox on the login form and associate session/cookie stuff.
• Redirect to originally requested page after successful login.

[danricho]

Adding integration of Authelia authentication would be very nice. I have no idea how to read the authenticated user from Authelia though....

Anyone know where to start?

[danricho]

reworked authentication to allow for both AUTHELIA and flask-login as well as disable entirely (ac14116).

Unfortunately, the CONFIG.YML changes will be breaking... but should be simple to fix.