Automatic merge of T1.5.1-1852-g24537f48e and 10 pull requests

- Pull request #570 at 362e4e7: glTF 2.0 support with PBR lighting
- Pull request #1062 at 9a76b26: Train Forces popup Window.
- Pull request #1064 at 1be1fc4: Add Train Info tab to Help window (F1)
- Pull request #1085 at 37e2817: updates key commands for Train Operations window and also Daylight Offset
- Pull request #1086 at e10390b: Add Settings Exporter tool (copy settings to INI, etc)
- Pull request #1090 at 9e0bfe8: Add null check to avoid crash on corrupt signal files
- Pull request #1092 at 7cc63cb: Adds $gradient, $req, depart-early and passing-time to Manual
- Pull request #1082 at 5845a1a: Allow variable water level in glass gauge
- Pull request #1081 at 689494b: Brake cuts power unification
- Pull request #1091 at b0c622b: Automatic speed control

Author: openrails-bot

Source/Documentation/Manual/operation.rst

@@ -614,7 +614,7 @@ AE in the .srv file as "Efficiency".
 
 If the AI train makes station stops, its maxspeed depends from the "Performance" 
 parameter for every route section, as can be seen and defined in the AI train 
-timetable (that is maxspeed is the product of the first MAxVelocity parameter by 
+timetable (that is maxspeed is the product of the first MaxVelocity parameter by 
 the "Performance" parameter divided by 100).
 
 Such performance parameter list is written (divided by 100) by the AE in 
@@ -632,6 +632,8 @@ This corresponds to MSTS behaviour.
 Moreover the Efficiency parameter is used also to compute acceleration and 
 braking curves.
 
+.. _operation-speed:
+
 Calculation of Train Speed Limit
 --------------------------------
 

Source/Documentation/Manual/timetable.rst

@@ -428,6 +428,8 @@ Special Rows
   The #dispose row presently does not affect the end of the run for the player 
   train.
 
+.. _timetable-train-speed:
+
 - ``#speed`` row
 
   This optional field defines maximum speed for trains, which may restrict the 
@@ -438,7 +440,7 @@ Special Rows
   If specified, only one ``#speed`` (m/s), ``#speedkph``, or ``#speedmph`` row 
   can be present in a single timetable file.
 
-  This row also accepts a number of :ref:`speed commands <timetable-speed>`.
+  This row also accepts a number of :ref:`speed commands <timetable-cmd-speed>`.
 
 - ``#restartdelay`` row
 
@@ -514,7 +516,7 @@ Gradient
     Syntax    
         ``$gradient /perc=n /speed=s``
 
-        The gradient command must be set in a ``#speed`` field of a train.
+        The gradient command must be set in the ``#speed`` :ref:`field of a train <timetable-train-speed>`.        
 
     Functionality    
         When gradient is set, forced acceleration is turned off if the leading engine of the train is on a 
@@ -1395,7 +1397,7 @@ A typical value for modern stock for the ``$dec`` command is 2 or 3.
     clear of the reverse position. This is useful when shunting in yards when 
     there is no need to fully exit the yard to reverse and the entry signal.
 
-.. _timetable-speed:
+.. _timetable-cmd-speed:
 
 Speed Commands
 ''''''''''''''