Update v0.5.c6c94c0

This update introduces some small new features, and fixes several smaller issues.

• Completely rewrote the AI pit-decision logic to improve race strategies and pitting behaviour.
  
• Adjusted several car colliders to improve car-to-car collisions.
  
• FIXED: Follow camera no longer zooms out excessively on tracks with a very low camera height.
  

• Automatically smooth height maps when importing from PNG.
  

• Added Japanese language localisation (thanks to Hiroshi Ashida).
  
• Small improvements to main menu performance.
  
• Fuel and tyre bars are now greyed out when they are set to 0% in the race settings.
  
• Fixed decimal values in times not being localised correctly.
  
• Moved the driver race blocks towards the top of the screen for increased visibility.
  

• The main menu sometimes experiences distortions or other rendering issues - changing resolution, or restarting the game may rectify the issue.
  
• Occasionally, when in Windowed mode, changing the language multiple times in quick succession can shrink the game window.