Created attachment 238912 [details] [review]
properties: Add functions to get the labels

This allows us to read the labels, duration, types, etc. that were
set so we can find commonalities between the properties already
set and the one we'd like to set.

Created attachment 238913 [details] [review]
properties: Add support for multiple files

UNFINISHED.

We need to know:
- how to display mixed-types of files. For example:
./test-properties-page ~/Music/*.mp3 ~/Videos/*avi
- how to display elements that don't match:
./test-properties-page ~/Music/Album/*.mp3
where the album name and artist are the same, but the titles are
different.

Here's some quick suggestions:

For mixed properties such as the Author, it might be useful to show the most frequent one and append something like "+3 others". I would use some toned down color compared to properties that are existent in the whole selection.

When no property repeats more than once, tone the label down as above, but use something like "Varies across 45 files"

When some items in the selection lack a property but is shared among the rest, I'd just tone down the label as above, but list the common property of the remaining items.

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