Require path and module return errors

[RyanChang25]

There seems to be a require path issues:

1. When requiring playfab-client/Types module in playfab-client on line 13.
2. When requiring PlayFabInternal module in playfab-client/Apis on line 3.

In addition, when the playfab-client/Types file is required, it throws an error for returning nil.