Use modern OpenGL Qt widget

Use cvfqt::OpenGLWidget and make required changes
- move code from paintEvent to paintGL to make grabFrambuffer work
- remove obsolete sharedWidget
- implement onWidgetOpenGLReady and initialize rendering in this function as OpenGL capabilities is required
- simplify snapshotImage to use grabFramebuffer

Fix missing include

ApplicationLibCode/UserInterface/RiuViewer.cpp

@@ -27,10 +27,8 @@
 #include "RiaPreferences.h"
 #include "RiaRegressionTestRunner.h"
 
+#include "Rim3dView.h"
 #include "RimCase.h"
-#include "RimGridView.h"
-#include "RimProject.h"
-#include "RimViewController.h"
 #include "RimViewLinker.h"
 
 #include "RivGridBoxGenerator.h"
@@ -60,20 +58,15 @@
 
 #include "cvfCamera.h"
 #include "cvfFont.h"
-#include "cvfOpenGLResourceManager.h"
 #include "cvfOverlayAxisCross.h"
 #include "cvfOverlayItem.h"
-#include "cvfPartRenderHintCollection.h"
-#include "cvfRenderQueueSorter.h"
-#include "cvfRenderSequence.h"
 #include "cvfRendering.h"
 #include "cvfScene.h"
 
-#include <QLabel>
-#include <QMouseEvent>
-
 #include <algorithm>
 
+#include <QLabel>
+
 using cvf::ManipulatorTrackball;
 
 const double RI_MIN_NEARPLANE_DISTANCE = 0.1;
@@ -92,8 +85,8 @@ std::unique_ptr<QCursor> RiuViewer::s_hoverCursor;
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-RiuViewer::RiuViewer( const QGLFormat& format, QWidget* parent )
-    : caf::Viewer( format, parent )
+RiuViewer::RiuViewer( QWidget* parent )
+    : caf::Viewer( parent )
     , m_isNavigationRotationEnabled( true )
     , m_zScale( 1.0 )
 {

ApplicationLibCode/UserInterface/RiuViewer.h

@@ -23,15 +23,9 @@
 #include "RiuInterfaceToViewWindow.h"
 #include "RiuViewerToViewInterface.h"
 
-#include "cafFontTools.h"
-#include "cafMouseState.h"
 #include "cafPdmInterfacePointer.h"
-#include "cafPdmObject.h"
-#include "cafPdmPointer.h"
 #include "cafViewer.h"
 
-#include "cvfStructGrid.h"
-
 #include <memory>
 
 class RicCommandFeature;
@@ -73,7 +67,7 @@ class RiuViewer : public caf::Viewer, public RiuInterfaceToViewWindow
     Q_OBJECT
 
 public:
-    RiuViewer( const QGLFormat& format, QWidget* parent );
+    RiuViewer( QWidget* parent );
     ~RiuViewer() override;
 
     RiuViewer( const RiuViewer& ) = delete;