Blender Git Loki

Cleanup: Moved conversion to float to CryptomatteHash.

Cleanup: Introduce CryptomatteHash struct.

Cryptomatte: Lookup name by encoded hash.

Cleanup: moved cryptomatte manifest functions.

Cryptomatte manifest reader.

With the cryptomatte manifest reader it is possible to construct a
cryptomatte layer from a manifest.

Merge branch 'master' into temp-cryptomatte-manifest-parser

Cryptomatte Manifest parser.

THis commits adds a basic parser to construct a CryptomatteLayer from a
manifest string. The goal is to be able to parse OpenExr Cryptomatte
Layers from external render engines and use it in the new cryptomatte
workflow.

Cryptomatte: testcases for Cryptomatte layer.