Fit, scale, snap, move improvements in Sky Replacement

I think following improvements are needed in order to enhance user experience:

Fit to Image option (off by default)
Scale slider set to zero with ability to scale sky down and up
Snap to side when moving a sky (i.e., auto-constrain). Needed when your source is same size as your sky replacement image and all you want to do is move it up/down.
Keyboard shortcuts available for incrementally repositioning sky (e.g., Cmd+Arrow keys)

Shangara.

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