New Demo

Here are the main of these changes:

• The Player character automatically stops in front of an obstacle instead of continuing to run into it
  
• Changed the camera's behavior when hitting walls
  
• Improved FPS everywhere by using a different system of light calculation
  
• Added hot tuning of mouse sensitivity and inertia of the game camera
  
• Added a tuning option to increase the number of enemies involved in a simultaneous firefight
  
• Reworked and improved most female character models