Replaced all references to RemoteTech2 with RemoteTech.

To keep future repository confusion to a minimum, I've also changed references in `src/RemoteTech` and its contents, even though they won't be visible to players. This will probably require some manual tweaking of *any* unmerged code changes, including outstanding pull requests and personal forks. I apologize for the inconvenience, but this is a one-time change.