[Feature Request] Support of HTML embeddede images

[pilzcer]

The support of HTML embedded images is helpful, when Jellyfin is not accessible from the outside and no data shall be shared with a 3rd party. From the coding point of view this should be a rather "easy" modification.

Here is an example of the HTML code of these two types:

<img src="https://upload.wikimedia.org/wikipedia/commons/8/8e/Red-dot.svg" />

vs.

<img src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==" />

This example is taken from wikipedia.

Within UploadToImgur in the class PosterImageHandler you do already the big part of the work. This is the encoding of the image as base64.

PosterImageHandler.cs:77 > Convert.ToBase64String(File.ReadAllBytes(posterFilePath)

Within FetchImagePoster in the class PosterImageHandler a new case statement is need, where you prepend the string "data:image/jpeg;base64, " to the base64 encoded image.

So the more complex part is to add an additional switch for this option.

Thanks
Rene

[pilzcer]

Here is an example code:
#124