* add converters and fix FSTQuery.{h,m} only
* address changes
* a change forget to address
* add a dummy function to make inline-only-library buildable
Similar to Objective-C, FieldPath and ResourcePath share most of their interface (and implementation) by deriving from BasePath (using CRTP, so that factory methods in BasePath can return an instance of the derived class).
* Move all Firestore files to Objective-C++
* Update project file references
* Don't use module imports from Objective-C++
* Use extern "C" for C-accessible globals
* Work around more stringent type checking in Objective-C++
* NSMutableDictionary ivars aren't implicitly casted to NSDictionary
* FSTMaybeDocument callback can't be passed a function that accepts
FSTDocument
* NSComparisonResult can't be multiplied by -1 without casting
* Add a #include <inttypes.h> where needed
* Avoid using C++ keywords as variables
* Remove #if __cplusplus guards
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