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.

src/qt/app.cpp

@@ -69,7 +69,7 @@ bool wxApp::Initialize( int &argc, wxChar **argv )
          * deleted as they are internally kept by Qt in a list after calling arguments().
          * However, there isn't any guarantee of that in the docs, so we keep arguments
          * ourselves and only delete then after the QApplication is deleted */
-        
+
         // Qt changed the arguments
         delete [] argv;
         argv = new wxChar *[qtArgs.size() + 1];