Return the bitmap data or base64 string data of a rendition

When using the createRendition API allow the option to return BitmapData or a Base64 string.

Use Case:
You make dank memes and want to copy your work to the clipboard (as BitmapData) and then paste it into a web page (eg, Imgur accepts BitmapData from the clipboard).

Use Case 2:
You are a web developer and want to insert the base64 data in your web page instead of create a separate file. You render to a base64 string, copy the string to the clipboard and then paste that string into your code.