SUMMARY
Change cropping to two clicks


OBSERVED RESULT
Pressing the crop button currently places a large cropping rectangle along the edge of an image. This is a bit of a pain to use if the image is large and the crop is small

EXPECTED RESULT
When pressing crop, it should dim the image (to indicate something has changed, the final crop area will not be dimmed), and clicking the first time will place the first crop anchor and clicking the second time will place the second crop anchor.