HTML5 Webcam Capture Support

HTML5 can (with permission & while served via https) access a client device's camera to capture an image and supply that back to the server for processing.

Let's make a view we can offer to support that feature as an alternate to using a server-side camera and running as a dev server, noting that it should perhaps only be made available to logged-in users (do a low-level user who has no perms to edit) if the site is to be publicly available.

For our primary customer's use, allow sign-ups only for those with an organizational email address and default those to a low-level user. Adjust some user accounts to be tied to officer addresses, and give edit access to those. Can use user-passes-test to allow low-level sign-ups but only to those using, for example, an organizational email address.

This would be good for the demo site, and we can perhaps set up a cron job that wipes files older than x time every y time so files don't build up. Have it send stdout to a log.