Draft: Fixes #23 full resolution image file

[ajmas]

This PR provides the support for writing out an image at the largest size the input device supports.

Currently none of the transformations are applied, so this will need to be done before the changes are considered ready. I have made this available in draft form, in case you want to push back on any of the changes.

BTW I haven't coded in Swift much, so there may be style and coding errors based on this.

Update: Mirroring now supported again, but still need to deal with rotation.