Added filter to viewer camera chooser.
Added filter to viewer camera chooser.

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