Colors Update

Hello everyone!

This update features a lot of small usability improvements, as well as a revamp of the old material system. Now you can select the material and color of a brick seperately to combine any color with any material!

Other improvements:

• Option to adjust the round timer for the battle game mode
• Brakes stronger for large vehicles
• Removed 5° play in the brake physics
• Fixed wheels always skidding above a certain speed
• Added a section in the material selection for already used materials
• A few new bricks