perl: module integration

[faxm0dem]

Curently the perl destination tries to load the script given using the script() directive.
IMHO it would be nice to be able to use an existing module in @INC instead:

perl(
  module("My::SyslogNG::Module")
  value-pairs(
    deinit-func("bye")
    scope(nv-pairs)
  )
);

This would for instance implicitly set init-func("My::SyslogNG::Module::init") and semi-implicitly deinit-func("My::SyslogNG::Module::bye")