Automatic merge of T1.6-139-g6b62c2a7d 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 73c47b4: 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 #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 #1166 at 51e7f7a: Simplify loading of internal and game textures
- Pull request #1167 at 115325f: Fix: RunActivity slow to terminate because of long sleep in Host Process

Author: openrails-bot

Source/RunActivity/Viewer3D/Processes/HostProcess.cs

@@ -64,7 +64,7 @@ public class HostProcess
 
         private const int DoHostTime = 10000;
         private const int SleepTime = 100;  // must be short enough for timely termination
-        private const uint DoHostIntervall = DoHostTime / SleepTime;
+        private const uint DoHostInterval = DoHostTime / SleepTime;
 
         public HostProcess(Game game)
         {
@@ -99,7 +99,7 @@ void HostThread()
                 Thread.Sleep(SleepTime);
                 if (State.Terminated)
                     break;
-                if (sleepCount % DoHostIntervall == 0)
+                if (sleepCount % DoHostInterval == 0)
                 {
                     if (!DoHost())
                         return;