* [feature] overhaul the oidc system
this allows for more flexible username handling and prevents account
takeover using old email addresses
* [feature] add migration path for old OIDC users
* [feature] nicer error reporting for users
* [docs] document the new OIDC flow
* [fix] return early on oidc error
* [docs]: add comments on the finalization logic
* convert most of the caches to use result.Cache{}
* add caching of emojis
* fix issues causing failing tests
* update go-cache/v2 instances with v3
* fix getnotification
* add a note about the left-in StatusCreate comment
* update EmojiCategory db access to use new result.Cache{}
* fix possible panic in getstatusparents
* further proof that kim is not stinky
tobi