Enhance the SeparatorWidget to allow for more customizations

The Separator Widget is very basic and there are other use cases where a programmer would like to just show a simple block of text or just the line. The widget should be enhanced to allow for the toggling of the following properties:
- Text
- Horizontal Line
- Setting the Style of the text

This will require a new FilterParameter subclass to be created that contains all the properties that need to be passed onto the FilterWidget. Then the filter widget can specifically work with this subclass by checking in its constructor for proper down casting.