Fix credential-based microsoft authentication

[PierreSchwang]

• Microsoft adds multiple Set-Cookie headers in their response, which this change now respects.
• Additionally, the used ClientID in the oauth20_token.srf-Route is invalid and should be equal to the one from the login endpoint (otherwise the granted code is invalid due to different environments)
• Removed the unused parameters from MsAuthenticationService#getLoginResponseFromCreds (No need for deprecation as this method is private either way) Fixes #27