Add 'SecureFoundation' build dependency.
Replace crypto manager and SSKeychain with SecureFoundation.
Remove old constants.
Update SecureFoundation.
Update readme with new security stuff
Add app password submodule.
Begin replacing built-in password controls with imas controls.
Fix a few issues in password integration
No need to pop duplicate alerts since the passcode controller handles that for us now.
Update encrypted core data submodule location.
Use iMAS functions for hashing and XOR'ing instead of running them manually.
Add notice about why this file is still here and a suggestion that iMAS be used instead.
Merge branch 'securefoundation' of https://github.com/projecthreader/hReader into development