tagging improvements for squadbox

[kmahar]

• option to auto generate tags based on perspective api scores
• let user predefine some tags to show mods, maybe give descriptions of these tags for mods (i.e. put things about my work under x, put things that are harassing but not death threats under y)
• turn on follow/mute tags for squadbox (this should be mostly there on the backend, but we need to incorporate it into message delivery logic, and add it to the ui / copy over some ui from murmur.)