include possibly not needed?

A vector should be enough?

Why not a hash here?

The CI complains about a missing return statement here... And I was also surprised that this thing is public API, but looking at `AsComponent` it indeed is...

Adding launchable to the Qt interface is actually a must-be-present feature for the next release, as that's a key new feature and using `desktopId` is deprecated in favor of it.

Are these really necessary? I would argue that this is only needed in case the Qt/C++ interface is incomplete and someone therefore wants to use the C library directly. In that case, we should rather fix the Qt binding to include the missing stuff, and not give library users the means to hack around it and not report the issue.