Implemented U2F, refactored Two Factor authentication, registering U2F device and authentication should work. Works on Chrome on MacOS with a virtual device.

src/db/models/mod.rs

@@ -6,6 +6,7 @@ mod user;
 
 mod collection;
 mod organization;
+mod two_factor;
 
 pub use self::attachment::Attachment;
 pub use self::cipher::Cipher;
@@ -15,3 +16,4 @@ pub use self::user::User;
 pub use self::organization::Organization;
 pub use self::organization::{UserOrganization, UserOrgStatus, UserOrgType};
 pub use self::collection::{Collection, CollectionUser, CollectionCipher};
+pub use self::two_factor::{TwoFactor, TwoFactorType};