Version 5.0 ROS1

Like version 4.0 but reloading of worlds now properly doesn't disable subscribers and keeps performance stable

Version 4.0 ROS1

• Jackal robot and velocity-controlled flying robot available for spawning, with camera and IMU sensor
• Changable weather, lighting, spawn pose, toggling dynamic flying and ground objects
• Forest world and Scifi maze-like world with high perceptual aliasing
• Runs up to 2x realtime on a table PC with one robot