Create repository
Initial import
Add STSecurityRandomization, a wrapper around the RNG
Add STSecurityKey{,chainAccess}, wrappers around accessing the Keychain
Add STSecurityEncryption, a wrapper around asymmetric encryption
Free allocated buffers in error conditions
Actually implement keychain item accessibility
Default to no padding for unknown values
License under the MPL 2.0
Refactor keychain access to class methods

It didn't end up needing any state.
Install external headers
Deal with assertions being disabled
Add tests for STSecurityKey instantiation
Don't leak fetched key refs
Don't delete matching keys before generation
Use one tag for both public and private keys
Remove paddingNone test to try to make this more deterministic
Check for conflicting tagged keys before generation

Also add a test to catch this.
Allow fetching private key data
Add the ability to import RSA key data