Deleted files reappear as empty files when re-entering a room

[t-mullen]

1. Delete a file with one other person.
2. Leave the room after some time.
3. Rejoin and the file will be recreated as an empty file with the same path.

[t-mullen]

YJS dumps emits the history of create/deletes on sync, instead of giving the current state. Combined with the async nature of the filesystem, this allows files to be remade (multiple async create/deletes started at the same time will result in the file being created)