Added tooling for OpenAMQ

Didn't capture commit history on all this, though it goes back to
1995 or so. This source is here for reference. It's grouped into:

* base1 - original iMatix tools, Libero, SFL, SMT, boom, gurudoc,
  various versions of gsl.

* base2 - main tooling used for OpenAMQ: xnf, icl, ipr, smt, asl,
  opf, http, boom3, Xitami/5. This is a rich resource of GSL code
  that is fun to read, though I'd not ever suggest using it.

* foreign - APR, PCRE, zlib.

* GSL/4 - original version of GSL/4, now in its own repository on
  github.