mainwindow never actually is disposed

[nukeandbeans]

This causes the Quake process to continue running in the background. Adding mainwindow.Instance.Dispose(); below mainwindow.Instance.Exit(); at line 232 of sys.cs fixes this issue.

I was going to create a PR for this but I'm using a different project setup and didn't want to pollute things.

[Memorix101]

Thank you. I will add it. 🙂