Debug Console Update

- bugfix Debug Console did not show included subtemplates since 3.1.17
(forum 25301)
- bugfix Modifier debug_print_var did not limit recursion or prevent
recursive object display at Debug Console
(ATTENTION: parameter order has changed to be able to specify maximum
recursion)
- bugfix Debug consol did not include subtemplate information with
$smarty->merge_compiled_includes = true
- improvement The template variables are no longer displayed as objects
on the Debug Console
- improvement $smarty->createData($parent = null, $name = null) new
optional name parameter for display at Debug Console
- addition of some hooks for future extension of Debug Console