* Use python executable directly
* python2 is not guaranteed to exist
* scripts aren't directly executable on Windows
* Add Firestore v1 protos
* Point cmake at Firestore v1 protos
* Regenerate protobuf-related sources
* Make local protos refer to v1 protos
* fixup! Regenerate protobuf-related sources
* Remove v1beta1 protos
* s/v1beta1/v1/g in source.
* s/v1beta1/v1/ in the Xcode project
* Remove stale bug comments.
This was fixed by adding an explicit FieldPath API rather than exposing
escaping to the end user.
Previously, the tests would compare serialization results against a
precomputed (via protoc) array of bytes. Now they serialize via our
nanopb based class and deserialize via libprotobuf (and vice versa) and
then ensure the result is the same as the input
Gil