Make the suspension effects sliders non-linear, make available range …

…of adjustment significantly bigger

Add option for increased impact of longitudinal weight transfer
Use average deflection across the front axle rather than separate L and R deflections for load effect calcs in case of uneven ground under pit box
Only acquire the nominal deflections once per session in case of visits to the pits for repairs, etc
Don't let the compiler interfere, do the conditionals around the SSE in asm