Use absolute positioning to avoid repaints.
Fixes setting absolute positions.
Avoid having to set the zIndex on every mouse move thus avoiding repaints :)
Stops querying the document.style for the fontSize, cache the value and reuse, only update on board resizing.
- Makes the whole tableu the droppable target, not only its top card.
- Also caches the absolutePosition of the piles.
Invalidates pile position cache on board resizes.
Fixes calculation of the Tableu absolute size.