PaintingItem now implements Placeable. Completes Vanilla-425

Signed-off-by: Austin Payne <payneaustin5@gmail.com>
Use float versions of new template-based SpoutMath classes.

Signed-off-by: Wolf480pl <wolf480@interia.pl>
Merge pull request #649 from ampayne2/painting

PaintingItem now implements Placeable. Completes Vanilla-425
Merge pull request #650 from Wolf480pl/master

Use float versions of new template-based SpoutMath classes.