1. Port QML canvas based screenshot cropper to QWidget + QPainter based cropper
2. Fix minor bugs with cropper while porting, like system font not being set for size indicator
3. "Include mouse pointer" setting now blends the cursor into the screenshot right away, letting the user see it while cropping, rather than blending it in after cropping
Before:
{F5830086}
{F5830115}
After:
{F5830100}
{F5830117}
BUG: 394503