Implement DXF INSERT scale

This has a chance of being wrong due to how the dimensions are stored in these intermediate objects

pcbnew/import_gfx/dxf_import_plugin.cpp

@@ -491,6 +491,7 @@ void DXF_IMPORT_PLUGIN::addInsert( const DL_InsertData& aData )
         std::unique_ptr<IMPORTED_SHAPE> newShape = shape->clone();
 
         newShape->Translate( translation  );
+        newShape->Scale( aData.sx, aData.sy );
 
         m_internalImporter.AddShape( newShape );
     }

pcbnew/import_gfx/graphics_importer_buffer.h

@@ -39,6 +39,7 @@ public:
     virtual std::unique_ptr<IMPORTED_SHAPE> clone() const = 0;
 
     virtual void Translate( const VECTOR2D& aVec ) = 0;
+    virtual void Scale( double scaleX, double scaleY ) = 0;
 };
 
 
@@ -68,6 +69,14 @@ public:
         m_end += aVec;
     }
 
+    void Scale( double scaleX, double scaleY ) override
+    {
+        m_start.x *= scaleX;
+        m_start.y *= scaleY;
+        m_end.x *= scaleX;
+        m_end.y *= scaleY;
+    }
+
 private:
     VECTOR2D m_start;
     VECTOR2D m_end;
@@ -101,6 +110,15 @@ public:
         m_center += aVec;
     }
 
+    void Scale( double scaleX, double scaleY ) override
+    {
+        m_center.x *= scaleX;
+        m_center.y *= scaleY;
+
+        // we really can't handle scalex != scaleY cleanly...it would be an ellipse
+        m_radius *= scaleX;
+    }
+
 private:
     VECTOR2D m_center;
     double   m_radius;
@@ -136,6 +154,15 @@ public:
         m_start += aVec;
     }
 
+    void Scale( double scaleX, double scaleY ) override
+    {
+        m_center.x *= scaleX;
+        m_center.y *= scaleY;
+
+        m_start.x *= scaleX;
+        m_start.y *= scaleY;
+    }
+
 private:
     VECTOR2D m_center;
     VECTOR2D m_start;
@@ -171,6 +198,15 @@ public:
         }
     }
 
+    void Scale( double scaleX, double scaleY ) override
+    {
+        for( auto& vertex : m_vertices )
+        {
+            vertex.x *= scaleX;
+            vertex.y *= scaleY;
+        }
+    }
+
 private:
     std::vector<VECTOR2D> m_vertices;
     double                      m_width;
@@ -210,6 +246,12 @@ public:
         m_origin += aVec;
     }
 
+    void Scale( double scaleX, double scaleY ) override
+    {
+        m_origin.x *= scaleX;
+        m_origin.y *= scaleY;
+    }
+
 private:
     VECTOR2D            m_origin;
     const wxString      m_text;
@@ -253,6 +295,18 @@ public:
         m_end += aVec;
     }
 
+    void Scale( double scaleX, double scaleY ) override
+    {
+        m_start.x *= scaleX;
+        m_start.y *= scaleY;
+        m_bezierControl1.x *= scaleX;
+        m_bezierControl1.y *= scaleY;
+        m_bezierControl2.x *= scaleX;
+        m_bezierControl2.y *= scaleY;
+        m_end.x *= scaleX;
+        m_end.y *= scaleY;
+    }
+
 private:
     VECTOR2D m_start;
     VECTOR2D m_bezierControl1;