* discovery generation received several fixes:
  * API title is now included
  * subresource schema are now properly included
  * absolute path generation has been fixed
* OpenAPI generation now uses new Google extension names
* API config validation has been refactored to include things that were
  previously bundled in JsonConfigWriter, which is deprecated
* Framework dependency has been updated to 1.9.49
* Most dependencies on the App Engine SDK have been removed or made
  optional, such as datastore Blob support
* Some dead code has been removed