added support foer base64 (dataurl) and file:/// sources url for markdown

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[michael-hawker]

Thanks @Fefedu973 for the PR, though I don't think we had an issue on this, that's the best place to start.

These can already be handled by the IImageProvider contract to allow the application the most power in deciding what content it supports and loads. We don't want to be arbitrarily loading bits.

It could be better for the contract of the config to maybe provide a list of IImageProviders so that it's easier for the app to delegate responsibility for certain things per provider. Then we could provider a few default providers, such as ones that allow loading from disk or from data as you've done here instead. This way the behavior of if an application allows these data forms is configurable and they can customize any extra behavior (such as loading from a virtual file system).