[SIM] Improve / Add Launch Script

Improve / Add Launch Script for both:

• DroneOA project (Priority)
• Individual users (include who want to use this for his own project, we should allow them to choose features)
• Ensure to correctly close all nodes and script (including ports) on shutdown

Tips:

• To start a test session with minimum feature (Graphic Flight Status), you will need to launch:
  • SITL sim (sim_vehicle.py -v ArduCopter)
  • simple_UDP.py script (Pass-through and reformate UDP data from SITL sim)
  • UE4 sim (Main visualizer)
• To start a test session with a depth camera and lidar, you will need to launch:
  • All the above
  • rosbridge_tcpnode (Publish data from UE4 to ROS)
  • imageToPC2 or imageToPC2RS node (Convert depth image to PointCloud2)

You may need to modify scripts for sending and handling shutdown signal