In case an empty query is given use the query name to fetch it.
- name callbacks similar as in other xo* packages
- render www-files with syntax highligher (adding links)
- improve rendering of package-view calls (left column was to small)
- improve validity of HTML markup
- don't treat "@" as API command in syntax highlighter
- remove "api" prefix from functions in the "::apidoc::*" namespace
- mark externally called functions as public