[Azoth Sarin] Code style fixes.
[Azoth Sarin] Link to sodium.
[Azoth Sarin] Allow generating the key during acc registering.
[Azoth Sarin] C++14 for Sarin.
[Azoth Sarin] Added ToxThread.
[Azoth Sarin] ToxThread::IsStoppable().
[Azoth Sarin] Use correct key and byte order.
[Azoth Sarin] Schedule status change function only if stoppable.
[Azoth Sarin] Implement ToxAccount::ChangeState().
[Util] Indirect connection to parent's destroyed() signal.

Fixes cases where the parent is "owned" by the child with
DeleteLaterPolicy.
[Azoth Sarin] Handle status changes.
[Azoth Sarin] Link to toxcore.