- Allows JPEGs on the server, both to pass content checks, and to make use of stored content-types (instead of assuming image/png).
- Puts an clip.image.type into shot objects
- Uses .jpg for filenames when appropriate
- Adds a new buildSetting for controlling the cutoff when we use JPEG
- If a PNG image is too large, tries to make a JPEG and substitutes if the JPEG is actually smaller
- Refactor some data:-URL and blob converstion functions into their own module