Adds support for building Lokinet as a system extension, and fixes
various problems in the macos implementation found during development of
the system extension support.
- Added contrib/macos/README.txt with description of the cancer
happening here.
- Add provisioningprofiles that Apple wants to make things work properly
- Made the entitlements files match the provisioningprofiles
- Remove configured entitlements files; we *can't* change any of the
things here because they are closedly tied to the provisioningprofiles
-- which means if someone wants to build their own Lokinet, they have
to replace a bunch of crap and change application IDs throughout.
This is the hostile-to-open-source Apple way.
- Remove unused old lokinet binary, as we're no longer using it on macos
- Use a POST_BUILD rather than install to copy things around into the
right places
- Convert all the configure_file's to consistently use @ONLY
- Misc cleanups
