Minor Update v031

Minor Update (v031)

- reduced default steering responsiveness impact
- more drag but also more effective aerodynamics component
- fixed potential error in track length (deadline) calculation
- increased cooling penalty if cooler is blocked (non-empty space directly above)
- policeman less likely to move around when player gets close
- added alternative controls for keyboards without Numpad
- changed inventory window to have a red border when player is overburdened
- some additions to the help page/tooltips