Blender Git Loki

Hide collections menu: ignore excluded collections

Note: I didn't change the shortcuts, I think this is a separate decision
to be made. I just want at the moment to have the H operator to mimic
the upcoming popover.

Personally if we are to keep the 1-10 shortcuts (and they do work) I
think we should skip the excluded collections altogether.

In fact we could have an option to hide them from the outliner too.