* remove C++11 library feature from `Timestamp` (which is supposed to be "portable");
* fix return type mismatch (`bool` vs `BOOL`);
* removed unused `using` declaration;
* fix typo in function name.
* Add FieldValue::Reference
* Migrate FSTReferenceValue to FSTDelegateValue
* Build Objective-C components with CMake
Build only the things required for FSTFieldValue
* Rename nanopb::String to nanopb::ByteString
... and flesh it out.
* Remove const pb_bytes_array* constructor
* Use std:: prefixes
* Pull forward CopyVector
* Simplify nanopb::Reader/Writer construction
* Reuse ByteString construction in serializer
* Add nanopb_testing.h
* Make QueryData.resume_token a ByteString
* Use ByteString as FieldValue::blob_value
* Migrate FSTBlobValue to FSTDelegateValue
* Rework the ByteString API
* Make data(), begin(), and end() never return nullptr
* Make copies of pb_bytes_array_t* more obvious (also avoids ambiguity
with the private constructor).
* Remove constructors that duplicate absl::string_view
* Make ByteString::Copy just a constructor
* Remove EncodeBytes/DecodeBytes
These duplicate ByteString constructors
* Overhaul ByteString and users
* Remove most conversions from ByteString
* Put remaining conversions in nanopb_util as free functions
* Make ByteStringWriter accumulate in a pb_bytes_array_t*
* Have ProtobufSerialize use ByteStringWriter
* Avoid reserving/writing if we're not asked to append data
* Ensure ByteStringWriter initializes/frees
* Make copies explicit
* Make Reserve match std::vector::reserve
* Add comments, assertions, and tests
* Migrate FSTNullValue to FSTDelegateValue
* Migrate FSTIntegerValue to FSTDelegateValue
* Migrate FSTDoubleValue to FSTDelegateValue
* Migrate FSTGeoPointValue to FSTDelegateValue
* Remove stale references to DatabaseId
* Have Firestore take the DatabaseId directly
* Allow tests to default the database implicitly
* Have FSTSerializerBeta take DatabaseId by value
* Have FSTUserDataConverter take DatabaseId by value
* Make FIRFirestore.databaseID a const reference
* Make FSTFirestoreClient.databaseID a const reference
* Have FSTReferenceValue take DatabaseId by value
* Have DatabaseInfo take DatabaseId by value
* Have Serializer take DatabaseId by value
* Fix C++ ReferenceValue
* Take DatabaseId by value
* Reverse order to match Android
* Rename `reference` to `key`
* Split data conversion tests into FSTUserDataConverterTests
* Add TestUtil Value/Object to match Java
* Port Java FieldValue tests
* FieldValue::Map -> ObjectValue (#3047)
Konstantin Varlamov