- Removed LDAP specific logic from login controller, placed in Guard.
- Created safer base user provider for ldap login, to be used for SAML
soon.
- Moved LDAP auth work from user provider to guard.
Also implemented more elegant solution to allowing session auth for API
routes; A new 'StartSessionIfCookieExists' middleware, which wraps the
default 'StartSession' middleware will run for API routes which only
sets up the session if a session cookie is found on the request. Also
decrypts only the session cookie.
Also cleaned some TokenController codeclimate warnings.