Respect cover art aspect ratio (e.g., for audiobooks

[jchaves]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
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Feature description

Currently, track covers are displayed in a, mostly, square format, with top and bottom cropped out for images that are "portrait" mode. (I listen to audiobooks on this app, and it shows only the center of the cover)

Diaplaying the full cover in these cases could be neat

Why do you want this feature?

I would like to be able to see the full cover when they are not "square-ish"

Additional information

I have made some "testing" changes that I'll include in a pull review so you can check what I mean. Something like:
Current:

Change already "working":

Optional? click on the cover image to expand, maybe? (work in progress, I need to get familiar with android stuff :) )