Allow setting drivers and keyframes for the bone visibility restriction
icon in the outliner. Before the button was a simple icon button, but it
is now connected to the RNA property to show the driven or keyframed
state.
Also when hiding a bone from the outliner it would be deselected, but
from the properties editor it would remain selected. This moves the
deselection to the RNA update function to ensure the bone is always
deselected.
Differential Revision: https://developer.blender.org/D7825
6f8d99322c