Blender Git Loki

VSE: Set view transform based on strip colorspace

In some cases, users start video editing work from General template,
where Filmic view transform is chosen by default. Currently, this causes
issue when working with sRGB footage, which are not properly decoded
into linear working space and final render looks miscolored.

When adding first strip, check it's colorspace and if it corresponds to
colorspace for byte images, ensure that view transform is set to
default value, which is Standard.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D11151