Automatic merge of T1.6-115-g0d2de70b7 and 12 pull requests

- Pull request #1082 at 8538170: Allow variable water level in glass gauge
- Pull request #1156 at f46d5f2: Fix incorrectly disabled options in train operations window
- Pull request #1091 at 492795a: Automatic speed control
- Pull request #1122 at b9b077b: Wagon Size and Centering Controls
- Pull request #1124 at e241a0d: Built-in PBL2 brake controller
- Pull request #1128 at d116396: Particle Emitter Overhaul
- Pull request #1157 at 39cd994: Dynamic brake authorization by TCS
- Pull request #1159 at 48c9a63: Skip OR warnings about TSRE-specific token Ruler
- Pull request #1160 at c64daa0: Route Based TTrack Sounds
- Pull request #1163 at 2f9e292: Fix: Crash when using Camera 8 and F9.
- Pull request #1164 at 1ad9889: Fix: F9 crashes with a front coupled single steam locomotive by Csantucci.
- Pull request #1165 at aacd11b: docs: Add code guidelines for logging

Author: openrails-bot

Docs/Contributing.md

@@ -4,7 +4,7 @@ This document will introduce you to a number of ways you can contribute to Open
 
 ## Discussion
 
-If you'd like to discuss anything Open Rails, please visit [our forums on Elvas Tower](https://www.elvastower.com/forums/index.php?/forum/190-open-rails-simulator-project/).
+If you'd like to discuss anything about Open Rails, please visit [our forums on Elvas Tower](https://www.elvastower.com/forums/index.php?/forum/190-open-rails-simulator-project/).
 
 ## Reporting a bug