DCS: world-lock virtual controller while clicked

[fredemmott]

With virtual touch screen, you can click and hold the signal lamp test button on the A10C then look around, e.g. at the signal lamps :p

With virtual controller, DCS releases the button as soon as the pointer stops looking exactly at it

This is very fiddly even with real VR controllers, and just doesn't work well. Instead, the controller should be world-locked while any button is pressed.

[fredemmott]

Done for orientation only, which helps a lot, but position can still be useful