Only scale HexaCubes, not GridPlaces

When GridPlaces were being scaled the colliders on them were also being
scaled, resulting in a lot overhead.

By scaling only the HexaCubes it becomes only a graphical operation,
reducing the CPU load. Multiplied by the 61 hexes in the board this
results in substantial savings.
Fix HexaCube movement

The hexacube originally moved out in front of the other cubes
so it would always be rendered in front of them. Turns out we scale
the cubes around it down so the movement is unneeded and actually
produces some graphical glitches.
Rearrange some if statements
Merge pull request #44 from pR0Ps/optimizations

Optimize GridPlaces