- Rename HashResult to EncryptedPassword to reflect its broader use
- Use EncryptedPassword in methods that require the hash and the salt, instead of passing them as strings separately
- Store EncryptedPassword as field in PlayerAuth; updatePassword() thus processes the entire data in the EncryptedPassword object
- Create Utils class for a common implementation of md5/sha1
- Create "foolproof" way of getting the MessageDigest for md5 etc. (MessageDigestAlgorithm enum)
- Create description annotations to annotate algorithms with usage recommendation and salt type
- Rename getHash() to computeHash(): get.. suggests it's just retrieving some field but it's really doing a computation, which is quite complex depending on the hash algorithm
