Cursor Locking,Controller Support and small bug fixes

This week I added several small things to the game.

• Controller Support got implemented by myself, it works very well in the editor just in WebGL some buttons are not responding correctly.
• Cursor locking is also a feature that is now included by pressing a button the player can decide to lock the cursor and if he wants to make it visible.
• Additionaly  I did some minor bug fixes to the AI the stealth alarming mode should now work proberly and to test performance I added an FPS counter.