Preview image caching

[Rukongai]

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Warnings

• This PR will change existing database contents.
• This PR introduces a breaking change to existing installations.

Summary

Creates resized images to facilitate faster loading

Description of changes

This creates a resized image of images to display on navigational pages (models, library, model files, etc)
Images are cached to tmp folder, I don't know if there is a better way of going about this but the change was pretty impactful for me. Maybe worth generating previews on discovery and attaching them to corresponding file in db?

Here are some before and after load times, loading a page with 24 items displayed

Test#	Page 1 Before	Page 1 After	Page 2 Before	Page 2 After
1	5.09s	.863s	12.43s	.794s
2	8.94s	1.25s	9.79s	.775s
3	3.74s	.762s	8.67s	1s
4	5.73s	.771s	8.05s	1.12s

Let me know if you want me to pr this in earnest

[Rukongai]

BTW I have a docker image built with my dev branch which should encapsulate all the changes I have PRs open for at rukongai/manyfold:dev if that is at all convenient.

[Floppy]

Very nice, I like it! Some of those images can be really heavy, so this is a great idea.

Apologies I'm not getting through merging your PRs very quickly - my wife broke her arm, so I'm hardly getting any work time at the moment! Bear with me for a bit, I'll get there 😄

[Rukongai]

There is literally no rush. I was recently laid off - so I'm just keeping myself distracted. Take care of your wife and life!

[Rukongai]

Sorry got sucked into a new project. I’m about to wrap it up and I’ll come back and clean all this up