Beta Backyard Kart 0.17.6

This update is fairly packed. It primarily focuses on wheel stability, but there are tons of other changes:

Frames:

• split frame meshes into three parts
• changed shape of front subframe

Engines:

• Added a new 350/500/750/1000cc engine mesh

Suspension:

• Adjusted front coilovers to match new geometry
• Adjusted rear coilovers
• Added a new front coilover mesh

Wheels:

• Significantly improved stability at high speeds
• Added a new 10x4 moto wheel mesh

Tires:

• Significantly improved stability at high speeds.
  • This came at the cost of some grip, but it feels much more natural now.