[WIP] Pretzel Express. For all your fast baked goods, you can rely on Pretzel Express*

#120 requested a "pretzel express", or "pretzel with a gui thats easier to spin up than command lines which are for idiots"

- [x] Stores sites details (directory, port)
- [x] Doesn't use Akavanche like the initial selection because lulzoverkill
- [x] Runs multiple sites real good now
- [ ] remember status of window (hidden/visible) on launch
- [ ] Tray icon have more control of stopping/starting sites

I'm really unhappy with this [one line](https://github.com/AwesomeGuyWhoIsAwesomeAtStuff/pretzel/blob/pexpress/src/Pretzel.Logic/Commands/CommandParameters.cs#L16), because without it Pretzel Express can't handle multiple sites nicely, but it may break Pretzel actual.


* Not to be confused with StarTrack Express, Planet Express, Pony Express or other baked good based expresses.