[chore] Refactor account deleting/block logic, tidy up some other processing things (#1599)

* start refactoring account deletion

* update to use state.DB

* further messing about

* some more tidying up

* more tidying, cleaning, nice-making

* further adventures in refactoring and the woes of technical debt

* update fr accept/reject

* poking + prodding

* fix up deleting

* create fave uri

* don't log using requestingAccount.ID because it might be nil

* move getBookmarks function

* use exists query to check for status bookmark

* use deletenotifications func

* fiddle

* delete follow request notif

* split up some db functions

* Fix possible nil pointer panic

* fix more possible nil pointers

* fix license headers

* warn when follow missing (target) account

* return wrapped err when bookmark/fave models can't be retrieved

* simplify self account delete

* warn log likely race condition

* de-sillify status delete loop

* move error check due north

* warn when unfollowSideEffects has no target account

* warn when no boost account is found

* warn + dump follow when no account

* more warnings

* warn on fave account not set

* move for loop inside anonymous function

* fix funky logic

* don't remove mutual account items on block;
do make sure unfollow occurs in both directions!

testrig/testmodels.go

@@ -1845,6 +1845,15 @@ func NewTestNotifications() map[string]*gtsmodel.Notification {
 			StatusID:         "01F8MHAMCHF6Y650WCRSCP4WMY",
 			Read:             FalseBool(),
 		},
+		"local_account_2_like": {
+			ID:               "01GTS6PRPXJYZBPFFQ56PP0XR8",
+			NotificationType: gtsmodel.NotificationFave,
+			CreatedAt:        TimeMustParse("2022-01-13T12:45:01+02:00"),
+			TargetAccountID:  "01F8MH17FWEB39HZJ76B6VXSKF",
+			OriginAccountID:  "01F8MH5NBDF2MV7CTC4Q5128HF",
+			StatusID:         "01F8MH75CBF9JFX4ZAD54N0W0R",
+			Read:             FalseBool(),
+		},
 	}
 }