[Standalone] Persist window size and UI settings on exit

[guzzard]

Would be really nice if the window size and UI settings were persisted on exit, so that they are restored next time the application is opened.

Thanks for a really great application! 👍

[stephomi]

Persistent window size for standalone done : c7eeffc
Note that I'm not really maintaining the standalone app (unless it's something trivial such as just including a file like above).

As for the UI settings persistence, it's rather easy, but the annoying stuffs is the sheer amount of stuffs to keep track of.
Maybe I'll try to find a way to do it automatically for each ui elements.