Removed some unused classes from Editor/Controls

Signed-off-by: Chris Galvan <chgalvan@amazon.com>

Code/Editor/IEditorImpl.h

@@ -298,7 +298,6 @@ public:
     IEditorMaterialManager* GetIEditorMaterialManager() override; // Vladimir@Conffx
     IImageUtil* GetImageUtil() override;  // Vladimir@conffx
     SEditorSettings* GetEditorSettings() override;
-    IEditorPanelUtils* GetEditorPanelUtils() override;
     ILogFile* GetLogFile() override { return m_pLogFile; }
 
     void UnloadPlugins() override;
@@ -356,7 +355,6 @@ protected:
     CErrorsDlg* m_pErrorsDlg;
     //! Source control interface.
     ISourceControl* m_pSourceControl;
-    IEditorPanelUtils* m_panelEditorUtils;
 
     CSelectionTreeManager* m_pSelectionTreeManager;