U2025.05.21-1637: Automatic merge of T1.5.1-1829-g5cb0ed0a4 and 13 pull requests

- Pull request #570 at 362e4e790: glTF 2.0 support with PBR lighting
- Pull request #1062 at 9a76b26db: Train Forces popup Window.
- Pull request #1064 at 1be1fc484: Add Train Info tab to Help window (F1)
- Pull request #1084 at 13454ed62: Timetable: Calculate Delay While Stopped at a Station
- Pull request #1074 at e9a66c166: Gradient - commit 2024-16-12
- Pull request #1085 at 37e2817f6: updates key commands for Train Operations window and also Daylight Offset
- Pull request #1086 at e10390b0b: Add Settings Exporter tool (copy settings to INI, etc)
- Pull request #1087 at 1f64f0242: Improve warning message for signal location mismatch.
- Pull request #1088 at 4b3fa4c54: Preserve previous log file.
- Pull request #1089 at d750bd186: Fix Superelevation on Rigid Frame Rolling Stock Again
- Pull request #1090 at 33d258219: Add null check to avoid crash on corrupt signal files
- Pull request #1082 at 5845a1af5: Allow variable water level in glass gauge
- Pull request #1081 at 689494b6b: Brake cuts power unification