Bug Fixes & Look Sensitivity Slider

A small update to add some requested functionality and fix a couple of bugs:

• Fixed issue with VSync not working
  
• Rebinding keys should no longer overwrite gamepad controls. You may need to delete your config folder (found in AppData) to get gamepad controls back (usually "C:\Users\\AppData\Local\Astray\Saved\Config\" for Windows 7)
  
• Added a "look sensitivity" slider to the options menu. Works with both mouse & gamepad turning speeds. Also reduced the base sensitivity of the gamepad controls
  
• The cog-operated portcullises (portculli?) in the Caverns should now correctly save their state