[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/api/client/status/statuscreate_test.go

@@ -256,7 +256,7 @@ func (suite *StatusCreateTestSuite) TestReplyToNonexistentStatus() {
 	defer result.Body.Close()
 	b, err := ioutil.ReadAll(result.Body)
 	suite.NoError(err)
-	suite.Equal(`{"error":"bad request"}`, string(b))
+	suite.Equal(`{"error":"Bad Request: status with id 3759e7ef-8ee1-4c0c-86f6-8b70b9ad3d50 not replyable because it doesn't exist"}`, string(b))
 }
 
 // Post a reply to the status of a local user that allows replies.