enabled warnings

update changes

fix opam build

update gitigore

tidy up port to topkg

building with topkg

add ocamlbuild as build dep

guestimate ppx_deriving_hardcaml version as 1.1.0

update version to 0.3.1 and changes.md

port to ppx - remove camlp4

fix oasis testbench libs

fix waveterm version

fix opam file

update version to 0.3.0

update to latest hardcaml-examples repo