Implement static parameters in Handler methods

[sergeylukin]

Introducing new feature. Shouldn't break any existing functionality. Inspired by what can be done with mod_rewrite:

RewriteRule ^something$  index.php?page_ID=15

[sergeylukin]

After playing with it I got to conclusion that it'd be more flexible to provide one array with all the parameters in key-value format instead of adding them one by one as separate key-less arguments as it may be necessary to fetch parameters by their key name to make sure that desired parameter is fetched and not anything else. An example could be a Base Handler Class that adds some generic Hook in the __constructor and it cannot guarantee that every Handler that extends it has a static parameter passed in it's route. In that case, verification functionality may be required to verify that specific static parameter has been passed before adding the Hook.

I'll submit a commit with the changes described above soon.