Split off lots of editor functionality into new abstract INodeEditor class and viewport functionality into CBasicViewport class; added viewport subclasses and undo/redo system in the World Editor

UI/undo/CDeselectNodeCommand.cpp

@@ -0,0 +1,42 @@
+#include "CDeselectNodeCommand.h"
+#include "../CWorldEditor.h"
+
+CDeselectNodeCommand::CDeselectNodeCommand(INodeEditor *pEditor, CSceneNode *pNode, QList<CSceneNode*>& selection)
+    : QUndoCommand("Deselect"),
+      mpEditor(pEditor),
+      mpNode(pNode),
+      mpSelection(&selection)
+{
+}
+
+void CDeselectNodeCommand::undo()
+{
+    if (!mpNode->IsSelected())
+    {
+        mpNode->SetSelected(true);
+        mpSelection->push_back(mpNode);
+    }
+
+    mpEditor->ExpandSelectionBounds(mpNode);
+    mpEditor->UpdateSelectionUI();
+}
+
+void CDeselectNodeCommand::redo()
+{
+    if (mpNode->IsSelected())
+    {
+        mpNode->SetSelected(false);
+
+        for (auto it = mpSelection->begin(); it != mpSelection->end(); it++)
+        {
+            if (*it == mpNode)
+            {
+                mpSelection->erase(it);
+                break;
+            }
+        }
+    }
+
+    mpEditor->RecalculateSelectionBounds();
+    mpEditor->UpdateSelectionUI();
+}