Zoom magnification reversed

[bfrymire]

Zoom factors greater than 1 should mean zooming in, thus making things bigger on the screen. The way that STANNcam's zoom factors work is that factors lower than 1 zoom in.

I think reversing how zoom factors work will be more inline with people's expectations when using camera zooms.

Implementing this change should be as simple as flipping a couple of signs. However, making this change can break the zoom controls on existing projects using STANNcam. This change will technically be a major change because it breaks current functionality.

A possible solution to include backwards compatibility would be to add a global flag for which zoom magnification type you want to use.