* use observation in unit and preview tests instead of the async stream
* use a parsing approach that is independent of the sourcery annotation
* Fix observation deferred fulfillments not receiving the initial value
Observation's observe only emits transitions, not the value present at subscription time. Drop the leading initial value from the affected transitionValues sequences and assert it directly with #expect instead.
* improved docs
* Retrofit `deferFulfillment` onto snapshot tests.
* Convert a bunch of preview tests to the new fulfillment publisher
* Convert more tests
* Remove unneeded delays from the remaining tests
* Remove snapshotting delay option.
* Replace Prefire with a very similar but simpler and more direct approach
* Move PreviewTest snapshots to their new location (snapshotting default, mirrors UITests)
* Update acknowledgements
* Switch snapshot configuration extensions to a custom version
* Exclude snapshots from the PreviewTests target
* Fix acknowledgements
* Rename snapshotting preference keys
* Remove `skipPackagePluginValidation`
Mauro
Mauro Romito
Stefan Ceriu
Stefan Ceriu
Doug