Blender Git Loki

Fix T77161: Outliner - Hiding a Collection does not gray out children objects

Ensure that When checking "Hide in Viewport" option for a collection
that child objects are drawn grayed out for consistency with the
"Disable in Viewports" toggle.

For checking an object visibility in the viewport the flag
BASE_VISIBLE_VIEWLAYER should be used instead of BASE_VISIBLE_DEPSGRAPH
because the latter ignores viewport visibility.

Manifest Task: T77161

Differential Revision: https://developer.blender.org/D7904