Fileformats-medimage

Fixes bugs in converter unittests

Added MR contrast image types and fixes a bugs in the handling of image contents

What's Changed
* Touched up ITK union types by tclose in https://github.com/ArcanaFramework/fileformats-medimage/pull/28


**Full Changelog**: https://github.com/ArcanaFramework/fileformats-medimage/compare/v0.7.0...v0.7.1

What's Changed
* Adding ITK supported formats by tclose in https://github.com/ArcanaFramework/fileformats-medimage/pull/27


**Full Changelog**: https://github.com/ArcanaFramework/fileformats-medimage/compare/v0.6.7...v0.7.0

What's Changed
* fixed up import location for FileSet by tclose in https://github.com/ArcanaFramework/fileformats-medimage/pull/26


**Full Changelog**: https://github.com/ArcanaFramework/fileformats-medimage/compare/v0.6.6...v0.6.7

What's Changed
* Update import paths to match base package by tclose in https://github.com/ArcanaFramework/fileformats-medimage/pull/25


**Full Changelog**: https://github.com/ArcanaFramework/fileformats-medimage/compare/v0.6.5...v0.6.6