v0.7.9 released

This is a fairly minor bugfix release. In particular:

• Downgraded to an older version of Qt that doesn’t have an annoying bug
• Improved some of the HTML templates for the web preview
• Made the web preview actually escape special characters that needed to be escaped

There’s a lot of stuff I want to do on this project in the future, like replacing the GUI with something less awful (Qt is such a pain to work with) and also I’m working on some experimental stuff for automatically generating liner notes for my own purposes.