Implement Photo Blur on observations annotated as "Dead"

[tiwane]

So we discussed this have decided not move forward with a specific way of handling observations of dead organisms or observations that include gory images. What we want to focus on instead is making better filters, including exclusion filters, in the user interface on Explore and Identify. Unfortunately, that won’t happen until Explore is rewritten. In the meantime, you can currently exclude annotations by editing the URL, see https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki-part-2-of-2/18792