Gameplay Improvements:
* Jank removal - there was a lot of jank in the rendering code. It should be way faster and less janky.
* Dark Mode - now exclusively toggled by your system settings, no more override toggle (sorry!)
* Dark Mode - cards are now bright, like in light mode. (Thanks Teddy!)
* Foundation Location - their order is now up to you, from the Preferences screen. (Thanks again Teddy!)
* Game Logic - update card movement formula to correctly validate tableau movement (감사합니다!)