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/scopedptr.h

@@ -238,8 +238,8 @@ public:
     T& operator*() const;
 
     /**
-        Smart pointer member access. Returns pointer to object. 
-        
+        Smart pointer member access. Returns pointer to object.
+
         If the internal pointer is @NULL this method will cause an assert in debug mode.
     */
     T* operator->() const;