Feature Request: Sorting gallery view items

[sbatchelder]

It's great that we can filter Media and Localizations but sometimes what you really need is to be able to sort them according to a user or built-in attribute.

Feature Request: add ability to sort Media and Localizations in gallery views according to one or more of their attributes.

Example: Sorting Localizations by a model's confidence-score, or by their height/width. Sorting video Media by their video length.