In particular, if the song info panel isn't visible, we should skip loading other song assets, such as album art. This would allow the user to limit use of more resource-heavy features, without descending into configuration hell, and also keep stmps usable on smaller displays.

Implementation-wise, this should be both a hotkey toggle and a configuration option. I think the latter will be more useful, as I suspect users will more likely want it either on all the time, or off all the time, rather than wanting to pop it up and down.