erk.   hazzy: might need you look at this one.   Got this error when typing in machine.feed-override.set into an action slider in Designer.

```
Traceback (most recent call last):
  File "/home/james/Documents/qtpyvcp_joco-nz/qtpyvcp/widgets/input_widgets/action_slider.py", line 31, in actionName
    bindWidget(self, action_name)
  File "/home/james/Documents/qtpyvcp_joco-nz/qtpyvcp/actions/__init__.py", line 110, in bindWidget
    method.ok(*args, widget=widget, **kwargs)
InvalidAction: class feed_override has no attribute 'ok' raised while trying to bind 'machine.feed_override' action to '<qtpyvcp.widgets.input_widgets.action_slider.ActionSlider object at 0x7f23bbfc1550>'