Auto-detect log to be a sequence setting rather than an global setting

[yanga18281014]

Auto-detecting log video color space is a great feature.

However, if I enable this feature in a new project and simultaneously open an old project, the log cuts with LUT in the old project will appear disorganized, forcing me to remove Lumetri with LUTs manually or turn off this feature temporally  

It would be helpful if this feature could be applied on a per-sequence or per-project basis, rather than as a global setting."

[R Neil Haugen]

Agreed. Getting this sort of CM option per sequence is especially useful when you've got say SDR and HDR from the same media to deliver ...

Neil