[Feature Request] Optional IV for Encryption

[itlancer]

Feature Description

Please consider IV (Initialization Vector) argument as optional for Encryption.encrypt() and Encryption.decrypt().
Sometimes data encoded by AES-CBC without IV and it should be decoded somehow (of course it more vulnerable). Right now IV argument mandatory to use Encryption functions.
I think AIR should have a way to use these functions without IV.
https://stackoverflow.com/a/20888967
https://anycript.com/crypto

Related issue: #229

Known Workarounds

Pass IV argument as ByteArray with 16 zero bytes:

var iv:ByteArray = new ByteArray();
iv.length = 16;
Encryption.encrypt(data, key, iv);