aero loads should load transfer

Doing load transfer differently

Fix typo

fix more typos

Load transfer correctly now

its not longer amateur hour

Add final check to two wheeling

Fix two wheel case

latest version

move tire_load calculation to a function, add tests to slip angle function

Add unit tests for the _get_tire_loads function

Make code simpler

Clean up assertions

Cn calculation more explicit
Merge branch 'fix_aero_transfer' of github.com:georgepearman/LapSim into fix_aero_transfer