Light : Make `visualiserAttributesPlug()` methods public
Light : Make `visualiserAttributesPlug()` methods public

Public plugs should have public accessors.

ImageEngine/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,lucienfostier/gaffer,boberfly/gaffer,boberfly/gaffer,ImageEngine/gaffer,boberfly/gaffer,hradec/gaffer,hradec/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,hradec/gaffer,hradec/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,appleseedhq/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,boberfly/gaffer,hradec/gaffer,ImageEngine/gaffer,johnhaddon/gaffer