[Feature Request] <originalSize></originalSize> for displaying media in native res

[duiz]

One issue I often stumble on in different themes is the stretching of media, especially videos which can differ per system and introduce artifacting, shimmering and noise. Basically, it would be useful to add a <originalSize></originalSize> that displays the media in its native res so that some media can be more dynamically displayed without it affecting the quality of the source.

The issue has been briefly discussed here: https://retropie.org.uk/forum/post/160022