Adds a "daily newest / oldest" sort - this will add a new 2 key sort: first, by the date part of the datetime (ie by day updated), then, alphabetically.
The render function has also been updated to separate the main sort key visually - a header for every new day.
Since models are uploaded in batches, this is essentially alphabetical sort per batch, with a clear separation of batches.
This update also includes my previous fix which makes sort listen to the bases currently filtered (plus added a proper function to construct the dict), and applies it to both date and daily sorts.