Drop the unique_ptr for m_spaceMouse since it can't be forward declared

Also we probably don't want to leak that class header everywhere

eeschema/sch_base_frame.cpp

@@ -86,7 +86,8 @@ SCH_BASE_FRAME::SCH_BASE_FRAME( KIWAY* aKiway, wxWindow* aParent, FRAME_T aWindo
                                 const wxSize& aSize, long aStyle, const wxString& aFrameName ) :
         EDA_DRAW_FRAME( aKiway, aParent, aWindowType, aTitle, aPosition, aSize, aStyle,
                         aFrameName ),
-        m_base_frame_defaults( nullptr, "base_Frame_defaults" )
+        m_base_frame_defaults( nullptr, "base_Frame_defaults" ),
+        m_spaceMouse( nullptr )
 {
     createCanvas();
 
@@ -106,6 +107,15 @@ SCH_BASE_FRAME::SCH_BASE_FRAME( KIWAY* aKiway, wxWindow* aParent, FRAME_T aWindo
 }
 
 
+SCH_BASE_FRAME::~SCH_BASE_FRAME()
+{
+#if defined( KICAD_USE_3DCONNEXION )
+    if( m_spaceMouse != nullptr )
+        delete m_spaceMouse;
+#endif
+}
+
+
 SCH_SCREEN* SCH_BASE_FRAME::GetScreen() const
 {
     return (SCH_SCREEN*) EDA_DRAW_FRAME::GetScreen();
@@ -294,7 +304,7 @@ void SCH_BASE_FRAME::ActivateGalCanvas()
     {
         if( !m_spaceMouse )
         {
-            m_spaceMouse = std::make_unique<NL_SCHEMATIC_PLUGIN>();
+            m_spaceMouse = new NL_SCHEMATIC_PLUGIN();
         }
 
         m_spaceMouse->SetCanvas( GetCanvas() );

eeschema/sch_base_frame.h

@@ -96,8 +96,7 @@ public:
                     const wxPoint& aPosition, const wxSize& aSize, long aStyle,
                     const wxString & aFrameName );
 
-    virtual ~SCH_BASE_FRAME()
-    { }
+    virtual ~SCH_BASE_FRAME();
 
     void createCanvas();
 
@@ -264,7 +263,7 @@ protected:
 
 private:
 #if defined( KICAD_USE_3DCONNEXION )
-    std::unique_ptr<NL_SCHEMATIC_PLUGIN> m_spaceMouse;
+    NL_SCHEMATIC_PLUGIN* m_spaceMouse;
 #endif
 };