Game update

The primary concern of this update is to support Windows 8 tablet PC. The secondary concern is to add in-game user profiles as requested by players.

Changes:

• Added native support for touch control. It was only emulated before and it did not ensure intended experience in all cases.
  
• Full screen mode now works as borderless window covering entire screen instead of true full screen mode. It is more compatible with screen orientation changes and multi-monitor setups. It also allows to activate Windows 8 charms bar while playing full screen (especially useful on tablets).
  
• Added in-game user profiles. The feature can be activated in SETTINGS menu. Each user profile has its own game progress and achievements.
  
• Many optimizations and less important fixes.