Carbonworks F4 1.3.1

Minor hotfix following BeamNG's 0.36 update

Changelog :

• Fixed the screen appearing with a "No Texture" message following the removal of some common textures from the game files
• Updated thumbnails

Changelog :

• Switched to the new motorsport i4 sound
• Improved shift times

Changelog :

• Fixed a bug where reverse could not be engaged using arcade shifting
• Made the pit limiter smoother
• Greatly improved the tire model thanks to feedback from IRL F4 drivers
• Adjusted all setups to fit the new tire model
• Added black wheels
  
• Added rain tires