New Privacy methods

Added new privacy methods. New methods were added to expose the new privacy related endpoints
(see: https://gravityapi.atlassian.net/wiki/spaces/RECO/pages/917546/REST#REST-Privacy-related).

Fixed composer install

• Composer installer should work now, as license identifier is now correct
• Fixed GravityException namespace errors
• Removed composer.lock as this version does not have any composer based dependency
• Removed the vendor directory from the distribution, consult the readme when using the library