[ECS Regression]: transferPlayersToShip does not reset radar focus

[aBlueShadow]

If the players move to a new ship via transferPlayersToShip, the radar screens still remain centered on the old ship. This resets when the players manually log out and into the new ship again.

[oznogon]

transferPlayersToShip has several issues in ECS in addition to this, need to document them

[oznogon]

Filed #2849, #2850; fixed by #2851.