wx/xml: Implement line-ending modes for xml saves

* Add 'wxTextFileType m_fileType' to hold the type
 * Add 'wxString m_eol' to hold the end of lines string

 * Add SetFileType() and GetFileType() to set and get the type
 * Add GetEOL() to get the end of lines wxString

 * Backwards compatibility preserved by using wxTextFileType_Unix

Change-Id: I3e8547b377e2c4060a3a2d97c299a08ea2c0a376
Signed-off-by: Adrian DC <radian.dc@gmail.com>

interface/wx/xml/xml.h

@@ -786,6 +786,16 @@ public:
     */
     const wxXmlDoctype& GetDoctype() const;
 
+    /**
+        Returns the output line ending format used for documents.
+    */
+    wxTextFileType GetFileType() const;
+
+    /**
+        Returns the output line ending string used for documents.
+    */
+    wxString GetEOL() const;
+
     /**
         Returns the document node of the document.
 
@@ -882,6 +892,11 @@ public:
     */
     void SetDoctype(const wxXmlDoctype& doctype);
 
+    /**
+        Sets the output line ending formats when the document is saved.
+    */
+    void SetFileType(wxTextFileType fileType);
+
     /**
         Sets the root element node of this document.