Automatic merge of T1.5.1-913-g91804456c and 16 pull requests

- Pull request #570 at 3539862: Experimental glTF 2.0 support with PBR lighting
- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder
- Pull request #882 at 1a5693d: Blueprint/train car operations UI window
- Pull request #886 at 6c0785b: Scene viewer extension to TrackViewer
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #896 at 5866028: First implementation of https://blueprints.launchpad.net/or/+spec/specific-sounds-for-ai-trains
- Pull request #903 at f588e31: Downloading route content (Github, zip)
- Pull request #910 at 97d4569: Allow building code using .NET 6 (Windows)
- Pull request #911 at 6834af0: docs: Add refactoring as a special type of PR
- Pull request #912 at f7b85e4: New Triple Valve Features Vol. 2
- Pull request #919 at 1a376fa: Added mouse wheel support for controls which can be moved by pressing t…
- Pull request #920 at a94e403: Update RailDriver in Manual
- Pull request #923 at e0f3c55: Add curve squeal to route
- Pull request #924 at 6c2c3cd: Default Asset Improvements
- Pull request #925 at e3b1688: Fix brakeshoe force bug

Author: openrails-bot

Source/RunActivity/Viewer3D/RollingStock/MSTSLocomotiveViewer.cs

@@ -165,6 +165,7 @@ public override void InitializeUserInputCommands()
 
             UserInputCommands.Add(UserCommand.ControlGearUp, new Action[] { () => StopGearBoxIncrease(), () => StartGearBoxIncrease() });
             UserInputCommands.Add(UserCommand.ControlGearDown, new Action[] { () => StopGearBoxDecrease(), () => StartGearBoxDecrease() });
+            UserCommandControlTypes.Add(CABViewControlTypes.GEARS, new UserCommand[] { UserCommand.ControlGearUp, UserCommand.ControlGearDown });
 
             UserInputCommands.Add(UserCommand.ControlTrainBrakeIncrease, new Action[] { () => Locomotive.StopTrainBrakeIncrease(), () => Locomotive.StartTrainBrakeIncrease(null) });
             UserInputCommands.Add(UserCommand.ControlTrainBrakeDecrease, new Action[] { () => Locomotive.StopTrainBrakeDecrease(), () => Locomotive.StartTrainBrakeDecrease(null) });