feat(hand edit): make VR V4 environment init throwable
feat(hand edit): make VR V4 environment init throwable

this should be provided by the generator in future releases

BREAKING CHANGE: turns the init? into an init -> throws

watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk,watson-developer-cloud/ios-sdk