[fenix]China southern airlines ground power unit livery

This file will replace the texture of the original FENIX ground power supply, using the texture of the ground power supply car of China Southern Airlines (semi fictional). Although it replaces the original file, it also provides the original file that can be restored. In addition, this is the first time I released the file. Now it supports FENIX version 1.0.6.146. If you have any suggestions for improvement, please send a private letter