revert session key; update hidden wallet #218
Merged
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This PR updates the hidden wallet process such that the hidden wallet is derived from the seed in the same way as the standard wallet. This gives an advantage that the hidden wallet can be recovered from the backup file (as a 'standard' wallet) using the hidden wallet password.
PR #192 (session key) was reverted to both reduce code complexity with this PR and because we plan to use a different method based on ECDH (for encrypted USB communication).