rewrite and reoganize tools functions

* create stdext namespace which contains additional C++ algorithms
* organize stdext in string, math, cast and exception utilities

src/framework/otml/otmlexception.h

@@ -26,7 +26,7 @@
 #include "declarations.h"
 
 /// All OTML errors throw this exception
-class OTMLException : public Exception
+class OTMLException : public stdext::exception
 {
 public:
     OTMLException(const OTMLNodePtr& node, const std::string& error);