Add a minimum distance since last check

[Tinter]

If a player is just standing still, it is a waste to run nearObjects when we could deduce that nothing would change. We could check do a much cheaper check against the position to only update once we have moved a significant distance.

• [ ] Add a new CBA setting for distance (Either meters or percentage of range)
• [ ] Add check to main loop in https://github.com/Tinter/Tinter-Furniture/blob/master/furniture/functions/fn_init.sqf
• [ ] Set the initial value to something outlandish like [-10000, -10000, -10000] to pass the initial check.
• [ ] Update last position at the end of a cycle.