Beta Backyard Kart 0.17.6

I corrupted the front tire models when packing the mod yesterday. This update does include some fixes to the physics model of tires as well as fixes the missing tire issue.

The tire fixes only apply to the 10 inch and smaller race tires as they were the ones being tested. As usual, there is a lot of WIP in place, so expect a few mesh issues here and there such as misaligned tire meshes.

Changes

• 4x6 rims have been updated and realigned.
  • I only thoroughly checked the race tires for performance and mesh alignment
• 8x6 rims have been updated and realigned.
  • As above, the non-race tires may be misaligned.
• Tire updates
  • 4x6 rims
    • 12, 10, and new 8 inch race tires have a new jbeam setup to help mitigate bouncing
  • 8x6 rims
    • 10 and new 8 inch race tires have a new jbeam setup to help mitigate bouncing
    • 8 inch tires have a placeholder texture
• Increased strength of the wheel connections
• Made a few refinements to the frame
• Updated meshes here and there