New viewpoint. Working doors.

• Metal power now switches to USE when facing a door.
  
• USE can now open/close doors. Though, the usefulness of closing a door is debatable. I should maybe just automatically close the door after 5 seconds or so.
  
• Changed the viewpoint to be higher up, making it more RPG-like and lighter on the FPS. Perhaps, I will have a button to switch between viewpoints.
  
• I made some discoveries with BasicEffect when combined with the old school tilemap approach that I am using. Mainly that I can have 3 directional lights and an ambient light per tile! I started writing my own effect, when I discovered this, so now I don't need to.
  
• Added an in-game editor to speed up minor changes. Should be handy when adding lighting. Need to add level save code. Note: the editor will not be in the released version.
  
• Ice power now creates ice cubes in all 8 directions. Previously, it was only the 4 cardinal directions like the air powers.
  
• HP and name of enemy injured now appears in HUD