Some bugfixes!

• Fixed ladder duplication glitch.
• Adrift will now run in the background, even if you minimize it.
• Added more fullscreen options (I don't even know what some of them do, but they could be useful).
• Adrift will now run even if it loses focus (this is useful for 2+ monitor setups).
• Fixed small glitch with the fade-in to the main menu.
• Physics accuracy has been swapped for performance (You will get much higher and more stable FPS although the physics may not be quite as accurate).
• Fixed a bug where the player would spawn as if entering the light world when loading a save.