Feature Request: Percentage of Screen Filled

[githottub]

Would be nice if there was a configuration option allowing the user to specify what percentage of the screen it fills. The default leaves a lot of empty space around the spectrum. I can imagine many people would like to have it fill more of the screen. Alternatively, there might be some who want to make it smaller if they leave the song info/cover art/etc up on the screen and don't want the visualization to overlap that.

Thanks!