Update User Controls

Update user controls to standard keyboard controls. Use the mouse to look and either keys W,A,S and D or the arrow keys to move.

Please note however that no jumping is required in this game so the space bar has been used to make it easier to tackle the puzzles.

When you are positioned in front of a puzzle, if you hold the space bar down you can move the mouse around without moving the player. This should make it easier to drag and drop items, press buttons etc. Also the scroll wheel can still be used to move the player forward and backward.

Apologies for the previous controls (seemed like a good idea at the time).