added exported attr to classpathentry and CGI dump to debug project

Eclipse couldn't recognize the lib on my system without this attribute.

TBH I don't think that we need this entry at all as this is only loaded at runtime by the slf4j-api lib;  you probably only needed it before this was removed:
https://github.com/getrailo/railo/commit/c207c8604ff3ca71630594ca9cf73f8d5d6baf4f#L1L378