plugin photos support tagging and annotation

[stefanocudini]

Something less complex would be probably better. Ideally something that can be used on a mobile screen to quickly annotate images taken with a camera.

Or alternatively something more in line with annotating data: https://github.com/recogito/annotorious

Originally posted by @poVoq in https://github.com/Keplerjs/Kepler/issues/60#issuecomment-743998760