Tidy consts for class D_PAD

Some accessors should be const:

* IsFlipped
* GetRoundRectRadiusRatio

Returning a objects by value as const in these cases is not helpful, as
all it does is prevent the caller moving from the return value, it just
forces a copy.

Some of thse functions come from base class overrides, those haven't
been changed.

* ShapePos
* GetPadName
* GetPackedPadName

pcbnew/class_pad.cpp

@@ -120,7 +120,7 @@ LSET D_PAD::UnplatedHoleMask()
     return saved;
 }
 
-bool D_PAD::IsFlipped()
+bool D_PAD::IsFlipped() const
 {
     if( GetParent() &&  GetParent()->GetLayer() == B_Cu )
         return true;
@@ -363,7 +363,7 @@ void D_PAD::AppendConfigs( PARAM_CFG_ARRAY* aResult )
 
 
 // Returns the position of the pad.
-const wxPoint D_PAD::ShapePos() const
+wxPoint D_PAD::ShapePos() const
 {
     if( m_Offset.x == 0 && m_Offset.y == 0 )
         return m_Pos;
@@ -378,7 +378,7 @@ const wxPoint D_PAD::ShapePos() const
 }
 
 
-const wxString D_PAD::GetPadName() const
+wxString D_PAD::GetPadName() const
 {
     wxString name;
 

pcbnew/class_pad.h

@@ -111,7 +111,7 @@ public:
      * @return true if the pad has a footprint parent flipped
      * (on the back/bottom layer)
      */
-    bool IsFlipped();
+    bool IsFlipped() const;
 
     /**
      * Set the pad name (sometimes called pad number, although
@@ -124,7 +124,7 @@ public:
      * @return the pad name
      * the pad name is limited to 4 ASCII chars
      */
-    const wxString GetPadName() const;
+    wxString GetPadName() const;
 
     /**
      * @return the pad name in a wxUint32 which is possible
@@ -132,7 +132,7 @@ public:
      * The packed pad name should be used only to compare 2
      * pad names, not to try to print this name
      */
-    const wxUint32 GetPackedPadName() const { return m_NumPadName; }
+    wxUint32 GetPackedPadName() const { return m_NumPadName; }
 
     /**
      * Function IncrementPadName
@@ -430,7 +430,7 @@ public:
         return m_boundingRadius;
     }
 
-    const wxPoint ShapePos() const;
+    wxPoint ShapePos() const;
 
     /**
      * has meaning only for rounded rect pads
@@ -439,7 +439,7 @@ public:
      * Cannot be > 0.5
      * the normalized IPC-7351C value is 0.25
      */
-    double GetRoundRectRadiusRatio()
+    double GetRoundRectRadiusRatio() const
     {
         return m_padRoundRectRadiusScale;
     }