[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!

internal/db/bundb/bundb.go

@@ -71,6 +71,8 @@ type DBService struct {
 	db.Report
 	db.Session
 	db.Status
+	db.StatusBookmark
+	db.StatusFave
 	db.Timeline
 	db.User
 	db.Tombstone
@@ -203,6 +205,14 @@ func NewBunDBService(ctx context.Context, state *state.State) (db.DB, error) {
 			conn:  conn,
 			state: state,
 		},
+		StatusBookmark: &statusBookmarkDB{
+			conn:  conn,
+			state: state,
+		},
+		StatusFave: &statusFaveDB{
+			conn:  conn,
+			state: state,
+		},
 		Timeline: &timelineDB{
 			conn:  conn,
 			state: state,