Make a copy of ImageFormatData that contains the effective color management
settings, and pass that along to the various functions. This will make it
possible to add more complex logic later.
For compositing nodes, passing along view and display settings through
many functions made it harder to add additional settings, so just get those
from the scene now.
Differential Revision: https://developer.blender.org/D14401
Also fixes missing code to read/write/free/copy color management settings
in various places. This can't be set through the UI currently, but still
should be handled consistently.
