Added P2P tunnel part for OpenComputers.

As discussed with @FireBall1725 on IRC, here's a PR adding a P2P tunnel part for OpenComputers networking.

Tested with and without OC, in dev-env and normal MC via vanilla launcher.

**Note**: requires [the localization](https://github.com/AppliedEnergistics/AppliedEnergistics-2-Localization/pull/85) and [API field](https://github.com/AppliedEnergistics/Applied-Energistics-2-API/pull/42) to be merged first, and submodules to be updated in order to build (in particular the API update for the added part field).

One thing that need specific review are the adjusted enums. I believe the ones where I did not append the entry to the end to be order irrelevant, but verification of that is needed.