A few improvements / bugfixes

I added a few small changes that improve the overall experience:

• Fixed issue with holes being carved out too much.
• Added saving of day/night cycle.
• Added sound control (sfx vs waves).
• Added Skip button (generously) if a hole is impossible (Considering a timeout for this).
• Added turning off of fps indicator.
• Removed flattening next to holes. Play the environment as it is!