Core update

Wait until my core patch is merged
>Considering that user should have a way to stop call at any moment..

The user would have to wait 10s, unless toxav_recv_video can magically return early when we stop a call, which it probably can now that I think about it. Can it ?

If you disregard that and decide not to wait the 10s, then there are probably many ways to make it crash, like loading a new profile while the call is not-quite-dead-yet.