Bug fixes

0.4.7

Fix for error thrown with rotated tiles, due to bug in PixelCache.
Remove unnecessary console warning re PixelCache uneven division.

0.4.6 (combined with 0.4.7)

Possible fix for issue #54 (moving to new scenes that do not have EV properties set).

Is Potato? Set shadows algorithm to "None" for the scene if performance mode is set to low.

Fix for warning about rendering failure with "/" when opening lighting configuration.