* 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
By using ordered list for json body, we can further minimize amount of data sent by getting rid of the index.
We still need previous asset ID, as we send only a subset of real data and server is unable to calculate it from the data sent.
We reached a point where it actually matters whether we say "realAppID" or just "r", since we're doing this sometimes even 600k times, multiplied by 9 properties that we have
