[Feature] SIGIL support

[NightFright2k19]

Since SIGIL is pretty much considered an official episode, it would be nice if there was support for it. Like for nerve.wad, it would probably make sense to have the launcher set up a path to find it first.

[DerTodIstEinDandy]

I'm sorry for the lack of response, but unfortunately I don't see myself touching this project in any forseeable future. It was nothing special to begin with, the functionality is as basic as it only can be, just a minor convenience tool for myself as well as a way to get into basic Python synthax. But now I'm also going through some exceptionally shitty events in life which i'm not quite sure yet how to handle, so I really have neither enough time nor motivation to work on this launcher. Thanks for trying it out anyway.

[NightFright2k19]

That's fair enough. Kind of a pity still since it wasn't missing much to feel complete. Maybe at least that pending pull request could still be considered. It's basically about removing needless features like forcing resolution settings and the GL exe. Also maybe an additional complevel for MBF21 could have been nice.

I have been trying to compile this by myself with the necessary script adjustments, but ended up with useless garbage. Maybe you could post some clear instructions how to compile, which tools you need etc, anything that might help a noob like me to get it working. I'd be willing to give this the final polish.

Another idea would be to add me as a contributor so I can do something. But first, I need to know what to do and how. Main goal would be to get the pull request in (after cleaning up the code from needless parts which were forgotten by the guy that made it) and get a new version compiled.