UGizmoBaseFloatParameterSource

[UGizmoBaseFloatParameterSource](API\Runtime\InteractiveToolsFramework\UGizmoBaseFloatParameterSource) is a base implementation of [IGizmoFloatParameterSource](API\Runtime\InteractiveToolsFramework\IGizmoFloatParameterSource), which is not functional but adds an OnParameterChanged delegate for further subclasses.