U2025.10.23-0540: Automatic merge of T1.6-145-g7915033ac and 11 pull requests

- Pull request #1082 at ebf087903: Allow variable water level in glass gauge
- Pull request #1156 at f46d5f27f: Fix incorrectly disabled options in train operations window
- Pull request #570 at 1b6b22e0b: glTF 2.0 support with PBR lighting
- Pull request #1091 at 492795a4d: Automatic speed control
- Pull request #1122 at 73c47b4cf: Wagon Size and Centering Controls
- Pull request #1124 at e241a0d12: Built-in PBL2 brake controller
- Pull request #1157 at 39cd994e1: Dynamic brake authorization by TCS
- Pull request #1167 at 115325f94: Fix: RunActivity slow to terminate because of long sleep in Host Process
- Pull request #1168 at 6e2942ff5: Fix exception when exiting with MapForm or SoundDebugForm open.
- Pull request #1169 at 6cf8c3e1b: Better Handling of Wagons with Invalid Bogie Configuration
- Pull request #1171 at 8fd2066cc: no internet connection is available, not possible to open the Menu Content Form