Add support for alternative disk encryptions

[andreasjunestam]

yontma should support other disk encryptions outside of Bitlocker, such as Truecrypt.

[mlynch-isec]

Based on Tom's comments in issue #22 we could also add a "force" option to let the user skip the drive encryption check if they have an alternate type of disk encryption.

[catskillmarina]

dm-crypt too.

[kill-9-me]

I'll add the desired support for Symantec WDE.

[andreasjunestam]

I think adding the force issue is the easiest solution in the short term. As long as there is a disclaimer that not having a TPM (with passphrase) enabled FDE will render the hibernation quite useless.

[mlynch-isec]

It's just TPM-only where hibernation is not effective. Hibernate is effective with recovery password only, startup key only, passphrase only, etc.