* Read directly into ExrChannel, eliminate intermediate MultiViewChannelName
* Pass multiple channels to EXR writer together in IMB_exr_add_channels
* Avoid various channel name parsing by passing components separately
* Simplify logic for writing multichannel and multiview metadata
* Remove unused global EXR handle storage
* No longer use void pointer for EXR handle.
* Use blender::Vector and std::string.
* Slightly reshuffle code so multipart support will have smaller diff.
* Add various comments.
Pull Request: https://projects.blender.org/blender/blender/pulls/146650
9851e34c71