Add New options

[ghost]

Autostart when the user logged in
Check for updates on Startup
Autoaccept files(per user allow/disallow, default:disallow)

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I am using qTox https://github.com/tux3/qTox
but since they stopped updating the core and it has "contact is offline even when they are online" bug
so I want to use ricochet.

[ghost]

pinging @tux3

[timkuijsten]

Like in most open source projects, time and resources are constrained, but a PR is always welcome.

[special]

Autostart when the user logged in

#359

Check for updates on Startup

#147

Autoaccept files(per user allow/disallow, default:disallow)

#15

Thanks!