Command line flags for scene heading format

Is your feature request related to a problem? Please describe.

Some screenwriters may prefer their scene headings to be double-spaced, bold, underlined, or a combination thereof.

Describe the solution you'd like

The addition of command line boolean flags for scene heading formatting, e.g.

$ wrap pdf My-Screenplay.fountain --double-space-scene-headings --bold-scene-headings

Or you could choose something less verbose/more fancy...

$ wrap pdf My-Screenplay.fountain --scene-headings=bold,underlined

Describe alternatives you've considered

I think the main alternative is afterwriting CLI , which uses the format:

$ afterwriting [FLAGS] --setting double_space_between_scenes=true --setting embolden_scene_headers=true

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