[Enhancement] Bullet list images

[alasdairmackenzie]

Category

• [X] Enhancement

Version

Please specify what version of the library you are using: [ 3.4 ] Please specify what version(s) of PowerPoint you are targeting: [ N/A ]

Desired Behavior

It would be great if the bullet point method allowed for an image so custom bullet points can be displayed

slide.addText({ 
  text: "I have a bullet", 
  options: { 
      bullet: { 
        code: "25BA",
        image_path : "image_path.jpg"
     } 
  }
});

Happy to create a PR (although might need some guidance) if you think this is worth adding.