Rather than holding parsers within warnings-plugin, move them to an external library, so that the same parser can be used for multiple plugins.

There is https://github.com/tomasbjerre/violations-lib that already duplicates some of the parsers (plus might add a few extra). Would you consider merging the parser logic into that library (and moving it into jenkinsci-organization in Github)?

See https://github.com/jenkinsci/violations-plugin/issues/88#issuecomment-266990121. I would assume some sort of a merge would be nice here.