Gui: Refactor navigation animations

- Animations are played through an Animator
- Standard animations have a fixed duration and inherit from QVariantAnimation
- The animation duration can be changed in the preferences
- Fix animations when using the two arrows above the NaviCube
- Start an animation or start and wait for an animation
- Replaces standard camera animations (e.g. by selecting standard views or NaviCube) with FixedTimeAnimation
- Replace View3DInventorViewer's CameraAnimation with FixedTimeAnimation
- Replace OpenInventor navigation style infinite spin animation with SpinningAnimation
- Stops an active animation when a new animation is started
- Stops an active animation when the user starts dragging, panning or zooming
- Refactor reorientCamera so it can be used in animations
- Enable animations by default

src/Gui/PreferencePages/DlgSettingsNavigation.cpp

@@ -88,7 +88,8 @@ void DlgSettingsNavigation::saveSettings()
     ui->rotationCenterSize->onSave();
     ui->rotationCenterColor->onSave();
     ui->spinBoxZoomStep->onSave();
-    ui->checkBoxUseAutoRotation->onSave();
+    ui->checkBoxNavigationAnimations->onSave();
+    ui->spinBoxAnimationDuration->onSave();
     ui->qspinNewDocScale->onSave();
     ui->prefStepByTurn->onSave();
     ui->naviCubeCorner->onSave();
@@ -115,7 +116,7 @@ void DlgSettingsNavigation::saveSettings()
     hGrp = App::GetApplication().GetParameterGroupByPath(
         "User parameter:BaseApp/Preferences/NaviCube");
     if (ui->naviCubeFontName->currentIndex()) {
-        hGrp->SetASCII("FontString", ui->naviCubeFontName->currentText().toLatin1());        
+        hGrp->SetASCII("FontString", ui->naviCubeFontName->currentText().toLatin1());
     } else {
         hGrp->RemoveASCII("FontString");
     }
@@ -129,7 +130,8 @@ void DlgSettingsNavigation::loadSettings()
     ui->rotationCenterSize->onRestore();
     ui->rotationCenterColor->onRestore();
     ui->spinBoxZoomStep->onRestore();
-    ui->checkBoxUseAutoRotation->onRestore();
+    ui->checkBoxNavigationAnimations->onRestore();
+    ui->spinBoxAnimationDuration->onRestore();
     ui->qspinNewDocScale->onRestore();
     ui->prefStepByTurn->onRestore();
     ui->naviCubeCorner->onRestore();
@@ -191,7 +193,7 @@ void DlgSettingsNavigation::loadSettings()
     QStringList familyNames = QFontDatabase::families(QFontDatabase::Any);
 #endif
     ui->naviCubeFontName->addItems(familyNames);
-    
+
     hGrp = App::GetApplication().GetParameterGroupByPath(
         "User parameter:BaseApp/Preferences/NaviCube");
     int indexFamilyNames = familyNames.indexOf(