U2023.03.29-0851: Automatic merge of T1.5.1-351-gc9abcd22b and 8 pull requests

- Pull request #570 at de7a14f73: Experimental glTF 2.0 support with PBR lighting
- Pull request #732 at 1edb2e5cc: Improvements for air brakes
- Pull request #751 at 00981a207: Web interface to control cab controls with external hardware
- Pull request #767 at 82c5f1cab: Refine sunrise and sunset
- Pull request #799 at eb92d81e5: Consolidated wind simulation
- Pull request #803 at 7157e08ac: Various adjustments to steam adhesion
- Pull request #809 at f67822a76: Some on-screen messages not suppressed, Bug #2008012
- Pull request #813 at 80789c6e4: Refactored garbage generators