Automatic merge of T1.5.1-664-gd39447273 and 8 pull requests

- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #865 at 776d6df: Dispatcher window improvements
- Pull request #874 at f8dbeab: Dynamic brake controller refactoring
- Pull request #875 at 43bf33e: Bug fix for https://bugs.launchpad.net/or/+bug/2036346 Player train switching doesn't work with 3D cabs
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder
- Pull request #878 at 90b5712: Implement Polach Adhesion
- Pull request #879 at 5a0ff7b: chore: remove Website folder
- Pull request #880 at 084b404: fix: Refined comment summarising property SData1

Author: openrails-bot

Source/Orts.Formats.Msts/TrackDatabaseFile.cs

@@ -902,7 +902,7 @@ public enum trItemType
         public float PX { get; set; }
         /// <summary>Appears to be a copy of X in Sdata, but only for X and Z</summary>
         public float PZ { get; set; }
-        /// <summary>Extra data 1, related to location along section</summary>
+        /// <summary>Distance of a track item along its containing track section and measured from the origin of the section</summary>
         public float SData1 { get; set; }
         /// <summary>Extra data 2</summary>
         public string SData2 { get; set; }