- Prior to this the parser would think that a non-latest reparse request was the latest because the only way we would check to see if a change reference was "latest" would be to do an equality check on the snapshot and `SourceChange`; the issue here was that `SourceChange` was null but the snapshots were the same. Problems could arise with this due to project context changes.
- Added tests to validate the new reparse behavior.
- Renamed `Edit` in the `BackgroundParser` to `ChangeReference` also refactored all the "edit" text in `BackgroundParser` to be `ChangerReference` like.
- Added a new event args to be the DTO between the internal and external parser implementations. This is how we could pas additional information in order to determine "latest" change reference.
#2336
