Create Encrypted Dataset with Keyfile on Server for Auto Unlock

[getBoolean]

• Add "create if not exists" button, use openssl.
• Add "unlock on boot" option, may require sudo/root
• Send the keyfile back to the app and give download button. Dataset cannot be created unless the keyfile already exists or created keyfile is downloaded.
• Add disclaimers:
  • When creating an encrypted dataset: User must check "I have downloaded and backed up the passphrase/keyfile. I understand that losing the passphrase/keyfile will result in total loss of data.'
  • When creating an encrypted dataset with the keyfile on server: User must check "I have backed my keyfile. I understand that in the event that the keyfile on the server is destroyed, my data will be unaccessible without the backed up keyfile."