Address Visual Studio analyzer warnings

include/openspace/util/spicemanager.h

@@ -856,7 +856,7 @@ public:
         };
 
         /// The shape of the returned field of view
-        Shape shape;
+        Shape shape = Shape::Rectangle;
 
         /// The name of the reference frame in which the #bounds are defined
         std::string frameName;

include/openspace/util/timeconversion.h

@@ -198,7 +198,8 @@ constexpr double convertTime(double t, TimeUnit sourceUnit, TimeUnit destination
         case TimeUnit::Year:
             seconds  = t * SecondsPerYear;
             break;
-        default: ;
+        default:
+            break;
     }
 
     switch (destinationUnit) {

include/openspace/util/timemanager.h

@@ -167,7 +167,7 @@ private:
     bool _shouldSetTime = false;
     Time _timeNextFrame;
 
-    bool _timelineChanged;
+    bool _timelineChanged = false;
 
     double _latestConsumedTimestamp = -std::numeric_limits<double>::max();
     int _nextCallbackHandle = 0;