1.6 improvements.

1.6.18 • Added multi-controller support • Resizable window mode while in VR (potentially cut down on rendering?) • Pilot model optimized for clients and AI • AI race start much faster (much... faster) • AI range of speed per match is broader • Fixed GK model • Fixed GK Cockpit VR hands • Brake now modulates Bias • Jump now cuts magnetic grapple • Sparking/Damage effects improved