[feature] More consistent API error handling (#637)

* update templates

* start reworking api error handling

* update template

* return AP status at web endpoint if negotiated

* start making api error handling much more consistent

* update account endpoints to new error handling

* use new api error handling in admin endpoints

* go fmt ./...

* use api error logic in app

* use generic error handling in auth

* don't export generic error handler

* don't defer clearing session

* user nicer error handling on oidc callback handler

* tidy up the sign in handler

* tidy up the token handler

* use nicer error handling in blocksget

* auth emojis endpoint

* fix up remaining api endpoints

* fix whoopsie during login flow

* regenerate swagger docs

* change http error logging to debug

internal/processing/admin/emoji.go

@@ -34,7 +34,7 @@ import (
 
 func (p *processor) EmojiCreate(ctx context.Context, account *gtsmodel.Account, user *gtsmodel.User, form *apimodel.EmojiCreateRequest) (*apimodel.Emoji, gtserror.WithCode) {
 	if !user.Admin {
-		return nil, gtserror.NewErrorNotAuthorized(fmt.Errorf("user %s not an admin", user.ID), "user is not an admin")
+		return nil, gtserror.NewErrorUnauthorized(fmt.Errorf("user %s not an admin", user.ID), "user is not an admin")
 	}
 
 	data := func(innerCtx context.Context) (io.Reader, int, error) {