Added PathChooserDialogue.pathChooserWidget() method.
Added PathChooserDialogue.pathChooserWidget() method.

This allows customisations to the dialogue contents to be made.

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