trdrop, now with a qt GUI

I'm proud to announce that this is the first GUI version of trdrop.

It should be at least as functional as the command line tool, with added frametime and better tear detection.

Please test the current Windows installer and notify me if you have any problems! After a week grace period I'll do some UX testing and incorporate the most needed bugfixes, then nothing stands between a "stable" v1.0 release.

We will try to provide you in the future with some more examples and an overview of the GUI.

For a full feature description please look at the README.md