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.

include/wx/qt/cursor.h

@@ -29,7 +29,7 @@ public:
 
     virtual wxPoint GetHotSpot() const;
     QCursor &GetHandle() const;
-    
+
 protected:
     void InitFromStock( wxStockCursor cursorId );
 #if wxUSE_IMAGE