Tracy panel addition

This pull request contains simple Tracy panel, which shows list of loaded files and their sizes (and also the size of combined files - the combined size in screenshot is bigger than the total one due to URL filters with no minification).

This is just a concept, I'm not really skilled in writing such CompilerExtensions nor Debug panels.

![snmek z 2014-06-24 03 48 54](https://cloud.githubusercontent.com/assets/3169646/3366317/78fc7b90-fb43-11e3-9a5d-7ce28ea1abe9.png)

you should use [htmlspecialchars](http://cz1.php.net/htmlspecialchars) to prevent XSS on every variable