[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/processing/account/bookmarks.go

@@ -33,7 +33,7 @@ import (
 // BookmarksGet returns a pageable response of statuses that are bookmarked by requestingAccount.
 // Paging for this response is done based on bookmark ID rather than status ID.
 func (p *Processor) BookmarksGet(ctx context.Context, requestingAccount *gtsmodel.Account, limit int, maxID string, minID string) (*apimodel.PageableResponse, gtserror.WithCode) {
-	bookmarks, err := p.state.DB.GetBookmarks(ctx, requestingAccount.ID, limit, maxID, minID)
+	bookmarks, err := p.state.DB.GetStatusBookmarks(ctx, requestingAccount.ID, limit, maxID, minID)
 	if err != nil {
 		return nil, gtserror.NewErrorInternalError(err)
 	}