Implement --use-names and --use-guids for DAE, OBJ, and SVG output.

src/ifcparse/IfcUtil.h

@@ -117,6 +117,11 @@ namespace IfcUtil {
 	bool valid_binary_string(const std::string& s);
 
     boost::regex wildcard_string_to_regex(std::string str);
+
+    /// Replaces spaces and potentially other problem causing characters with underscores.
+    void sanitate_material_name(std::string &str);
+    void escape_xml(std::string &str);
+    void unescape_xml(std::string &str);
 }
 
 template <class T>