Adds engine controls to electronic controls & tweaks portable generat…

…or (#2633)

* initial

* Format src/vehicle_use.cpp

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* Only shows engine options when there is one

* Format src/vehicle_use.cpp 2

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* Format src/vehicle_use.cpp 3

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---------

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data/json/vehicles/utility.json

@@ -126,7 +126,7 @@
       { "x": 1, "y": 0, "part": "frame_cover" },
       { "x": 1, "y": 0, "part": "tank_small", "fuel": "gasoline" },
       { "x": 1, "y": 0, "part": "stowboard_vertical" },
-      { "x": 1, "y": 0, "part": "controls" },
+      { "x": 1, "y": 0, "part": "controls_electronic" },
       { "x": 1, "y": 0, "parts": [ "wheel_mount_light", "wheel_small" ] }
     ],
     "items": [

src/vehicle_use.cpp

@@ -359,6 +359,22 @@ void vehicle::control_electronics()
 
         set_electronics_menu_options( options, actions );
 
+        if( has_part( "ENGINE" ) ) {
+            options.emplace_back( engine_on ? _( "Turn off the engine" ) : _( "Turn on the engine" ),
+                                  keybind( "TOGGLE_ENGINE" ) );
+            actions.push_back( [&] {
+                if( engine_on )
+                {
+                    engine_on = false;
+                    stop_engines();
+                } else
+                {
+                    start_engines();
+                    valid_option = false;
+                }
+                refresh();
+            } );
+        }
         uilist menu;
         menu.text = _( "Electronics controls" );
         menu.entries = options;