Automatic merge of T1.5.1-411-g51d4cd969 and 21 pull requests

- Pull request #570 at de7a14f: Experimental glTF 2.0 support with PBR lighting
- Pull request #757 at d9d75f4: Unify RailDriver code implementations
- Pull request #799 at dc03850: Consolidated wind simulation
- Pull request #802 at 4d198e4: Added support for activity location events to the TrackViewer
- Pull request #803 at 7157e08: Various adjustments to steam adhesion
- Pull request #813 at 7fdad38: Refactored garbage generators
- Pull request #815 at a5cc165: chore: Add GitHub automatic release notes configuration
- Pull request #818 at 0d2162a: Allow independent drive axles for locomotives
- Pull request #821 at e0fa5a8: Adds suppression of safety valves
- Pull request #823 at 5e1c03b: Select track sound volume percent retained in .eng and .wag files
- Pull request #824 at f16ebed: Update Readme.md
- Pull request #825 at 29ed427: 2D Cabview controls for side viewpoints https://blueprints.launchpad.net/or/+spec/2dcabview-controls-for-side-views
- Pull request #829 at 434af02: Improvements for air brakes #3 - Emergency valves
- Pull request #830 at 280ee74: Electric locomotive hot start
- Pull request #831 at c8927a4: preliminary version switchpanel on tablet
- Pull request #832 at bb8941f: Fix Cruise Control together with Train Brake
- Pull request #833 at 01aaca7: Implement brake relay valve
- Pull request #834 at 7a98eca: Replaces email service with FormSpark
- Pull request #835 at 8b4e134: Correct Brake Shoe Force Calculation
- Pull request #836 at 62e6d02: Adds policy on crashes and derailments
- Pull request #837 at 0497316: copies website policies to repo

Author: openrails-bot

Docs/Policies.md

@@ -0,0 +1,41 @@
+# Project Policies
+
+This document records the policies currently in place under which the Project Team operates.
+
+## License
+
+The [GNU Public License](http://www.gnu.org/licenses/licenses.html) allows a user to use Open Rails in any way, except that you may not distribute software containing part of Open Rails without respecting the license terms. 
+
+## Liability
+
+Open Rails is intended for entertainment purposes only and, to avoid liability, is not suitable for professional applications.
+
+## Code Submissions
+
+[Code contributions](https://github.com/openrails/openrails/blob/master/Docs/Contributing.md) to our repository must be in Microsoft's C# language. An authorised developer may not change content in the official version of Open Rails without approval from another authorised developer.
+
+## Content Compatibility
+
+Open Rails will continue to maintain compatibility with content from previous official versions of Open Rails.
+
+## File Formats
+
+New types of content will use the JavaScript Object Notation (JSON).
+Existing types of content from previous official versions of Open Rails will continue to be loaded without change. 
+
+## Keyboard Assignments
+
+New key assignments should obey the following rules where that is possible.
+
+* Reserve digit keys for camera operations.
+* Reserve Fn keys for pop-up windows.
+* Reserve the Alt modifier for debug operations.
+* Reserve modifier+space (e.g. Ctrl+space) for future expansion using sequences of keys.
+
+Existing key assignments may not be changed without community discussion and approval of the Open Rails Management Team.
+
+## Crashes and Derailments
+
+Open Rails simulates emergency events which bring a train to a standstill, such as a derailment, and provides both a visual indication and a notification of the problem.
+
+Open Rails does not show rolling stock leaving the track due to crashes or derailments. We have many members from the rail industry who have spent their working lives preventing incidents that cause injuries and loss of life and we respect that point of view.