Long overdue fixes to the Polaroid cameras.

- Mobs lying down are captured properly.
- Hair and other coloring is captured properly.
- Darkness is now captured, though other area effects are not.
- Object layering is much more accurate, though still not perfect.
- Objects that were missing should now be visible.
- Objects that should not have been visible should now be gone.
- Some objects (like blood trails) are not yet captured properly.
Fixed coloring, overlays on overlays, and blood trails.
Merge pull request #2826 from YotaXP/polaroid-fix

Long overdue fixes to the Polaroid cameras.