Applying filter_control_value on custom controls.

[jaredstander]

In the base plugin I've noticed that a new method has been added for controls called filter_control_value that can be used to transform output of that control to streamline and replace some of the existing output transformation filters. I'm noticing that when I declare this in the custom control in the same way it's declared in the control classes in the base plugin, it doesn't seem to be running this function. I also tried to add_filter for filter_control_value in the __construct method of the custom control similar to how it is in _base and also did not observe the function influencing the output. Can custom controls use filter_control_value?