Password encryption

[emoose]

Describe the feature you'd like to see added

ATM online usernames/passwords are stored inside Common.dat and very easy to extract - if you're sharing save games make sure not to include this file right now.

We could probably hook game to store it more securely, afaik there's Windows code we can use to encrypt it against the Windows acct so even if the file is shared it wouldn't be decryptable, might look into it soon.

(there is also some issue where the game sometimes refuses to save the online username/password, so you have to login again each launch, maybe can do something for that too...)

[emoose]

Added encryption for the data in 57034d1

Might also help with logins sometimes not being saved but not totally sure about that yet, if anyone notices their logins disappear please let me know.