Calculate suspension velocity for ac

[wasabinator]

The suspension velocity in the sim data isn't currently plumbed through to provide haptic effects, so this change implements that.

The changes I raised against simapi for the acmapper allow the effects to work from AC.

Example config used to test

{
    device       = "Sound";
    effect       = "SuspensionVelocity";
    tyre         = "FrontLeft";
    devid        = "alsa_output.usb-C-Media_Electronics_Inc._USB_Audio_Device-00.analog-stereo";
    pan          = 0;
    fps          = 60;
    threshold    = 0.2;
    channels     = 2;
    volume       = 70;
    modulation   = "frequency";
    frequency    = 35;
    frequencyMax = 55;
    duration     = 0.15;
    noise        = 3;
}

[Spacefreak18]

This is great.

Like I was saying in the simapi commit, if you think this is good, I say we just make this the default way to do suspension effects. So that would eliminate much of the boilerplate you had to do for this. Just use your new simdata->suspensionvelocity[] variable where necessary.