rfkill: Write to rfkill in a thread
It can take several seconds, freezing the UI. O_NONBLOCK makes no difference here.
Do we need a mutex of sorts? I would assume the kernel handle this when writing to the file?
In KF6 migration I aready made the method fire-and-forget so that I could change the implementation to be async.
Since it is BLUEZQT_NO_EXPORT I could change the signature, right?