rewrite and reoganize tools functions

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

src/framework/graphics/particlemanager.cpp

@@ -38,7 +38,7 @@ bool ParticleManager::load(const std::string& filename)
             }
         }
         return true;
-    } catch(Exception& e) {
+    } catch(stdext::exception& e) {
         logError("could not load particles: ", e.what());
         return false;
     }