XFlight: FPV Drone Simulator

Update Notes: - Fixed an issue where the hollow cup would be used by default during test flights in the workshop in some cases. It will now always use the player-selected aircraft for test flights. - Fixed an issue where landmark textures were missing in empty scenes. The ground texture in empty scenes has been restored to a mesh pattern. - Fixed an issue where timing would be inaccurate in some cases when using the first door as the timing door. - Experimental feature development. We will join the winnter sales, the game will sales 20%