Tidy snapshots to account for time out #5
Description
At the moment the snapshotting process creates a placeholder for each file before it creates a snapshot which it them removes when the snapshot process completes.
It does this so that it has accountability for screenshots which fail in process.
The problem is that any files that aren't complete inside the PHP exec timeout never get cleaned up, so it would be beneficial to parse through those when all snapshots are complete and perform a tidy up, removing those accounting files where a screenshot has been completed, just outside the time out.