I have now done the necessary cleanup. Looks like everything is in place.
Unfortunately, I do not yet have any actual parser that is not built-in,
but I think we can postpone working on that when the first one appears.
I don't expect troubles in that case, but you never know ;)

The implementation is now almost done and works, including doc. I now
need to verify shutdown, guess there are some resource leaks left...

looks like we are almost done and need only to add the ruleset parser-specific
config options.

another milestone commit: the program works, the new interface
is used, some more cleanup is needed and the per-ruleset config
options are still missing. But we are getting closer...

... getting the module structure a bit cleaner ;)

This is a milestone commit, which adds new code that breaks
nothing, but also does not add any visible change. Just prep work...

I cleaned up a lot of config variable access along the way. This
version compiles and runs, but does not yet offer any enhanced
functionality. pmrfc5424 is just a dummy that is not yet being used.

now cleaner and hopefully usuable as a basis for loadable parser
modules. I also cleaned up/consolidated some of the internal
message generation functionality in rsyslogd.