Fix sip problems / export gui classes to libraries

python/core/qgsvectorlayercache.sip

@@ -11,7 +11,7 @@
  * takes much longer than querying in bunches (e.g. network latency, slow views in the database...)
  */
 
-class QgsVectorLayerCache : public QObject
+class QgsVectorLayerCache : QObject
 {
 %TypeHeaderCode
 #include "qgsvectorlayercache.h"

src/gui/attributetable/qgsattributetablefiltermodel.h

@@ -27,7 +27,7 @@ class QgsVectorLayerCache;
 class QgsMapCanvas;
 class QItemSelectionModel;
 
-class QgsAttributeTableFilterModel: public QSortFilterProxyModel
+class GUI_EXPORT QgsAttributeTableFilterModel: public QSortFilterProxyModel
 {
     Q_OBJECT
 

src/gui/attributetable/qgsdualview.h

@@ -30,7 +30,7 @@ class QSignalMapper;
 /**
  * @brief
  */
-class QgsDualView : public QStackedWidget, private Ui::QgsDualViewBase
+class GUI_EXPORT QgsDualView : public QStackedWidget, private Ui::QgsDualViewBase
 {
     Q_OBJECT
 

src/gui/qgsattributedialog.h

@@ -27,7 +27,7 @@ class QgsVectorLayer;
 class QgsHighlight;
 class QgsDistanceArea;
 
-class QgsAttributeDialog : public QObject
+class GUI_EXPORT QgsAttributeDialog : public QObject
 {
     Q_OBJECT
 

src/gui/qgshighlight.h

@@ -27,7 +27,7 @@ class QgsVectorLayer;
 
 /** A class for highlight features on the map.
  */
-class QgsHighlight: public QgsMapCanvasItem
+class GUI_EXPORT QgsHighlight: public QgsMapCanvasItem
 {
   public:
     QgsHighlight( QgsMapCanvas *mapCanvas, QgsGeometry *geom, QgsVectorLayer *layer );