Future of aw-qt

A while back, I was looking for a nice syncthing UI for Windows (starting a terminal and running it there everytime when needed wasn't enough anymore) and I found [SyncTrayzor](https://github.com/canton7/SyncTrayzor) but never got around to installing it.

But today I did, and what surprised me was a full-blown WebView that shows the web UI. This is something I think we want for all our users by default. We would still be able to run the components separately and keep them modular (for those that prefer), but for the average user the only program they need to care about running should be aw-qt. It will handle the rest. Advanced users might want to run it "headless" so to speak (or on systems where we might not get much done in a while, such as on Android/iOS).

- [ ] aw-qt should have a option to open a window with a webview containing the web UI.
- [ ] aw-qt should ensure autostart on boot if it's such setting is set.
- [ ] aw-qt should access the web UI with authentication so that it isn't exposed to the network.
- There are many ways to do this: GET parameter (like git-annex-webapp), headers, etc.