Provide ability to display an image at its actual size

[marktaipan-cvisionai]

Currently an implicit zoom is applied when displaying images in the annotator. The user cannot specifically view the image at its actual size (particularly if it's smaller than the available canvas space). It would be helpful for ML related tasks if there was a way to do this.

This could be accomplished a couple of ways:

• Zoom function wasn't relative to the canvas space, but rather relative to the image's dimensions (e.g. 100% zoom == the media's dimensions like in Photoshop)
• Separate buttons to forcibly set the canvas to the media's size (e.g. buttons for "Fit To Screen", "Actual Size" like windows photo viewer).

This possibly could be extended to the video player.