Add icons to desktop pager

[andydotxyz]

They fill the space available according to window size.
It fills. Could be adjusted to fit in the center if folk prefer to maintain aspect ratio.

Checklist:

• Tests included. <- Hmm, didn't get this far yet but should be possible
• Lint and formatter run with no errors.
• Tests all pass.

[coveralls]

Pull Request Test Coverage Report for Build 7616917663

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 28.577%

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Totals
Change from base Build 7575318830:	-0.1%
Covered Lines:	1576
Relevant Lines:	5515

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💛 - Coveralls

[ghost]

This is a very-exciting PR!

For consistencies sake; It would be neat to still (at least optionally) have numbers drawn over the app-window previews though.

[andydotxyz]

For consistencies sake; It would be neat to still (at least optionally) have numbers drawn over the app-window previews though.

I moved the numbers from the button to labels hovering on top. Thanks for the suggestion.

[andydotxyz]

No further requests for change in nearly 2 weeks, merging