Fixed MessageWidget crashes encountered in Maya.
Fixed MessageWidget crashes encountered in Maya.

After much stumbling around in the dark, I've thrown in the towel on trying to get block level visibility edits working, and resorted to a simpler approach where messages are stored independently of the text widget.

andrewkaufman/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,davidsminor/gaffer,cedriclaunay/gaffer,johnhaddon/gaffer,goddardl/gaffer,goddardl/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,goddardl/gaffer,chippey/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,chippey/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,davidsminor/gaffer,ImageEngine/gaffer,cedriclaunay/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,hradec/gaffer,boberfly/gaffer,cedriclaunay/gaffer,boberfly/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,hradec/gaffer,hradec/gaffer,goddardl/gaffer,ivanimanishi/gaffer,hradec/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,cedriclaunay/gaffer,appleseedhq/gaffer,davidsminor/gaffer,lucienfostier/gaffer,boberfly/gaffer,boberfly/gaffer,GafferHQ/gaffer,davidsminor/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,chippey/gaffer,chippey/gaffer,ImageEngine/gaffer,hradec/gaffer,ivanimanishi/gaffer