Remove all trailing spaces

No real changes, just clean up sources by removing trailing spaces from
all the non-generated files.

This should hopefully avoid future commits mixing significant changes
with insignificant whitespace ones.

interface/wx/imaggif.h

@@ -1,9 +1,9 @@
-///////////////////////////////////////////////////////////////////////////// 
-// Name:        imaggif.h 
-// Purpose:     interface of wxGIFHandler 
-// Author:      Samuel Dunn 
-// Licence:     wxWindows licence 
-//////////////////////////////////////////////////////////////////////////// 
+/////////////////////////////////////////////////////////////////////////////
+// Name:        imaggif.h
+// Purpose:     interface of wxGIFHandler
+// Author:      Samuel Dunn
+// Licence:     wxWindows licence
+////////////////////////////////////////////////////////////////////////////
 
 #define wxIMAGE_OPTION_GIF_COMMENT wxT("GifComment")
 
@@ -25,13 +25,13 @@ public:
     */
     wxGIFHandler();
 
-    virtual bool LoadFile(wxImage *image, wxInputStream& stream, bool verbose = true, 
+    virtual bool LoadFile(wxImage *image, wxInputStream& stream, bool verbose = true,
                             int index = -1);
     virtual bool SaveFile(wxImage *image, wxOutputStream& stream, bool verbose=true);
 
     /**
         Save the animated gif.
-        
+
         @param images
             The image array object which is to be affected by this operation.
         @param stream