Dirk Hohndel 6548773ad6 Implement a cache for the scaled images
No point in scaling them every time the user looks at the dive. Over time
this may waste some memory (especially if people have a ton of pictures
and let the process run a very long time). For now I won't worry about
that.

Fixes #577

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
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