Cider Isn't Darwin Emulation, Really

Various framework stub updates/fixes master

Affected frameworks include: Accounts, CryptoTokenKit, Network, and most notably: SecurityFoundation. If we ever want to get the `security` CLI tool to actually do stuff and get Security keychains up and running, we're going to need to actually implement SecurityFoundation, which seems to just be an Objective-C wrapper around CommonCrypto