Replace sessionStorage with encrypted IndexedDb

[manusa]

• Generate SHA-256 hash from serverHost-user to use as IndexedDB store key (userId)
• Generate SHA-256 hash from serverHost-user-password to use as password key (hash)
• Store userId and hash in sessionStorage -> Allows page refresh
• If userId+hash exists in sessionStorage (PageReload), retrieve state from IndexedDB using userID as object key and restore encrypted state using hash as password to decrypt it.
• When a new state is published/stored, if key/userId exists in sessionStorage, update IndexedDB entry.

Plain text Credentials are never stored in FE, not even in Encrypted IndexedDB -> Always use hashes

https://github.com/bitwiseshiftleft/sjcl/