Use a forward declaration to avoid having to workaround Qt MOC

Don't think that guard was still needed, but a forward declaration is better anyways.

apps/opencs/view/render/cell.cpp

@@ -9,6 +9,7 @@
 #include <components/esm/loadcell.hpp>
 #include <components/esm/loadland.hpp>
 #include <components/sceneutil/pathgridutil.hpp>
+#include <components/terrain/terraingrid.hpp>
 
 #include "../../model/world/idtable.hpp"
 #include "../../model/world/columns.hpp"
@@ -17,9 +18,13 @@
 #include "../../model/world/cellcoordinates.hpp"
 
 #include "cellwater.hpp"
+#include "cellborder.hpp"
+#include "cellarrow.hpp"
+#include "cellmarker.hpp"
 #include "mask.hpp"
 #include "pathgrid.hpp"
 #include "terrainstorage.hpp"
+#include "object.hpp"
 
 bool CSVRender::Cell::removeObject (const std::string& id)
 {

apps/opencs/view/render/cell.hpp

@@ -6,18 +6,9 @@
 #include <memory>
 #include <vector>
 
-#include <boost/shared_ptr.hpp>
-
 #include <osg/ref_ptr>
 
-#ifndef Q_MOC_RUN
-#include <components/terrain/terraingrid.hpp>
-#endif
-
-#include "object.hpp"
-#include "cellarrow.hpp"
-#include "cellmarker.hpp"
-#include "cellborder.hpp"
+#include "../../model/world/cellcoordinates.hpp"
 
 class QModelIndex;
 
@@ -31,7 +22,11 @@ namespace osg
 namespace CSMWorld
 {
     class Data;
-    class CellCoordinates;
+}
+
+namespace Terrain
+{
+    class TerrainGrid;
 }
 
 namespace CSVRender
@@ -39,6 +34,12 @@ namespace CSVRender
     class CellWater;
     class Pathgrid;
     class TagBase;
+    class Object;
+
+    class CellArrow;
+    class CellBorder;
+    class CellMarker;
+    class CellWater;
 
     class Cell
     {

apps/opencs/view/render/pagedworldspacewidget.cpp

@@ -20,6 +20,7 @@
 #include "editmode.hpp"
 #include "mask.hpp"
 #include "cameracontroller.hpp"
+#include "cellarrow.hpp"
 
 bool CSVRender::PagedWorldspaceWidget::adjustCells()
 {

apps/opencs/view/render/unpagedworldspacewidget.cpp

@@ -16,6 +16,7 @@
 #include "../widget/scenetooltoggle2.hpp"
 
 #include "mask.hpp"
+#include "tagbase.hpp"
 
 void CSVRender::UnpagedWorldspaceWidget::update()
 {