Add support for my use cases

[kBite]

1. some "idempotent" (non user-visible) changes

   • make parameters and headers more readable
     • it's opinionated, but pretty much inline with what other modules do
   • refactor defined type rule moving boilerplate to new function
   • simplify rule with some new data types

2. add support for my use cases

   • add parameters outerface, daddr_type, saddr_type, and ctstate

Of course, everything comes with tests and documentation. I didn't add tests for the function though, because I'd consider it tested indirectly as part of tests done on rule.

EDIT: Tests are failing due to outdated REFERENCE.md. Can't find redcarpet right now. Tried ...

$ bundle exec gem install redcarpet
Fetching redcarpet-3.6.0.gem
Building native extensions. This could take a while...
Successfully installed redcarpet-3.6.0
1 gem installed

$ gem install --user redcarpet
Building native extensions. This could take a while...
Successfully installed redcarpet-3.6.0
Parsing documentation for redcarpet-3.6.0
Done installing documentation for redcarpet after 0 seconds
1 gem installed

$ gem install redcarpet
Building native extensions. This could take a while...
Successfully installed redcarpet-3.6.0
Parsing documentation for redcarpet-3.6.0
Done installing documentation for redcarpet after 0 seconds
1 gem installed

... but still:

$ bundle exec rake strings:generate
[error]: Missing 'redcarpet' gem for Markdown formatting. Install it with `gem install redcarpet`

Will dig deeper tomorrow.

[smortex]

REFERENCE.md is outdated

Please update REFERENCE.md with

$ bundle exec rake strings:generate:reference

Add it to the PR and CI should continue.