Revert "Using img elements as sprites (instead of cavasses)"
Revert "Using img elements as sprites (instead of cavasses)"

This reverts commit 11f858cc21cf49180dc2a182b2209b33f10fc59b.

CPU usage with canvasses was 9%, while with images 17%, both
with accelerated composing at 60Fps.

Also the selectability of images is not that nice.

ariya/X2,ariya/X2,ariya/X2