Authentication improvements

First steps toward offline mode - added new option in Settings which allows the client to function without connectivity to the server, even if the client gets restarted. For now, this is just a few hours, but as soon as I will be sure that the system properly works, this will be extended to days. This option will be removed in the future and will become default behavior of the client.

Bugfixes/Improvements

• [UI] Fixed a problem with Start Minimized not working properly under some conditions