Add dumpSymbol method to DrawViewSymbol based classes

- this is mainly for debugging output from Arch/Draft

src/Mod/TechDraw/App/DrawViewSymbolPyImp.cpp

@@ -1,6 +1,10 @@
 
 #include "PreCompiled.h"
 
+#include <Base/Console.h>
+#include <Base/FileInfo.h>
+#include <Base/Stream.h>
+
 #include "DrawViewSymbol.h"
 #include "DrawView.h"
 
@@ -17,6 +21,32 @@ std::string DrawViewSymbolPy::representation(void) const
     return std::string("<DrawViewSymbol object>");
 }
 
+PyObject* DrawViewSymbolPy::dumpSymbol(PyObject *args)
+{
+    const char* fileSpec;
+    if (!PyArg_ParseTuple(args, "s", &fileSpec)) {
+       throw Py::TypeError("** dumpSymbol bad args.");
+    }
+    auto dvs = getDrawViewSymbolPtr();
+    std::string symbolRepr;
+    if (dvs != nullptr) {
+        symbolRepr = dvs->Symbol.getValue();
+    }
+
+    Base::FileInfo fi(fileSpec);
+    std::ofstream outfile;
+    outfile.open(fi.filePath());
+    outfile.write (symbolRepr.c_str(),symbolRepr.size());
+    outfile.close();
+    if (outfile.good()) {
+        outfile.close();
+    } else {
+        std::string error = std::string("Can't write ");
+        error += fileSpec;
+        throw Py::Exception(error);
+    }
+    Py_Return;
+}
 
 PyObject *DrawViewSymbolPy::getCustomAttributes(const char* /*attr*/) const
 {