Refactor views_debug to support proper translated strings/placeholders

Currently the views_debug/vpr function aims to support translations and objects

        vpr('set_display() called with invalid display id @display.', array('@display' => $display_id));

but in fact the function doens't support placeholders at the moment.

The goal of the function is to

* Support placeholders
* Support arrays/objects
* Support direct translation/translation on render via the watchdog module.