Fix crop grid : gesture, aspect ratio, and painting area

[LeGoffMael]

This PR changes a lot of things in order to fix a lot of bugs:

List of fixes:

• When the aspect ratio was updated, the crop area kept getting smaller
• Some corner of the crop was not resizing properly (ie: topRight)
• The crop painter sometimes had spaces between the rects, this should be now definitely fixed using path difference combination
• The edges boundaries of the crop grid had similar problem, the rects overlay each other now

Before: ratio keep getting smaller + spaces between rect in paint area	With this PR: ratio change depending of size and no more space in paint area
RPReplay_Final1649309413.mov	RPReplay_Final1649325522.2.mov