v0.7.7 with some minor UI changes

I got some feedback from a user that showed that some aspects of the GUI (especially the distinction between album and track metadata) was a bit unclear, so I’ve made some minor tweaks to hopefully help with this. Most notably, there’s now placeholder/shadow text for the per-track metadata that makes it hopefully more obvious that those are only to override things on a per-track basis rather than something you have to fill out on every track!

I also changed some of the checkbox labels to hopefully make them a bit more clear what they do, too.

Really I just want to rewrite the whole UI now that I have a better idea of how it should fit. And I’d probably want to do it in something other than Qt, because gosh Qt’s kind of a pain to use.