- new plugin (opHID) to deprecate old one (rawhid).
- remove pjrc HID api implementation.
- add hidapi library taken from https://github.com/signal11/hidapi.git (copied files, the lib is not compiled from its git repo).
- history of those files is broken (cp instead of git mv) but the history is all in rawhid plugin.
- mac and windows not tested yet.
