Add IMove.MoveIntoWorld and IMove.VisualMove.
Use MoveIntoWorld for production.
Use MoveIntoWorld for Enter activities.
Use MoveIntoWorld for transports. Fixes #4758.
Remove RenderLandingCraft dependency on Mobile.
Remove RenderInfantry dependency on Mobile.
Merge pull request #4912 from pchote/exits

Clean up mobile world insertion.