Updated demo build to v0.8.2.

Changelog:

• General improvements and bugfixes,
• Tutorial stage added to the demo,
  
• New sprites for controls settings,
  
• Now left-handed users can enjoy Cyber Haze with the new adapted controls for both left and right hands!

Here's the list of new controls for left-handed users:

• WASD - Move
• J - Jump button
• K - Action button
• L - Dash button