Goodbye, Nanning v4.5 final version

Update as follows:

-Vertex lighting is used for the first, second and third level maps to enhance the sense of the picture.

-Adjusted the ambient lighting of the first and third levels, optimized the maps of all levels, and improved the
smoothness of the map.

-Change the first level zombies event +tank and the second level zombies event +tank to only zombies event.

-The third level of rescue needs to wait for some zombies event and tanks before opening the door.

-Other bugs have been fixed.