Add support for CyberTipLine/PhotoDNA (Image fingerprinting for CSAM detection and reporting)

Support for this should really be added to home servers. This is actually something that CloudFlare supports although Cloud Flare is unlikely to fix the problem. There needs to be something for home servers to prevent their users from uploading abhorrent material even if it's just best effort. https://www.microsoft.com/en-us/photodna https://blog.cloudflare.com/the-csam-scanning-tool/ https://report.cybertip.org/ws-hashsharing/v2/documentation/#overview https://report.cybertip.org/ispws/documentation/#curl-example