* Initial implementation of announce with diff
* Add missing logic pieces
* Change in logic
* Fix checksums
* Add deduplication logic
* Update SetPart.cs
* Use standalone endpoint for diff
* Use different hashcode impl
* Update AssetForListing.cs
* Misc
* Push all the changes for this to finally work
* Use original index rather than self-calculated
ASFB makes some calculations based on index, it's better for us to have holes rather than hiding skipped items.
* Handle edge case of no assets after deduplication
* Remove dead code
* Address trim warnings
* Misc optimization
