various pinhole_wizard enhancements

[ap--]

It would make the calibration a lot easier if any of the following things would be implemented:

[ ] extrinsics: different color for displayed points (and the cursor should be below them) [ ] extrinsics: the calibration routine should ignore points with nan's [ ] extrinsics: select the next row in points list with joystick button [ ] extrinsics: a move cursor to point button (if it's somewhere else on the projector screen) [ ] viewports: if the viewport list contains too many points, the window becomes to big (vertically) and is not resizable