[tor-bugs] #16680 [Tor]: make Ed25519 master key, signing key and cert ascii-armored on disk by default

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#16680: make Ed25519 master key, signing key and cert ascii-armored on disk by
default
-----------------------------------------+---------------------------------
 Reporter:  s7r                          |          Owner:
     Type:  defect                       |         Status:  new
 Priority:  normal                       |      Milestone:  Tor:
Component:  Tor                          |  0.2.7.x-final
 Keywords:  ed25519 keys, ascii-armored  |        Version:  Tor:
Parent ID:  #16645                       |  0.2.7.2-alpha
                                         |  Actual Points:
                                         |         Points:
-----------------------------------------+---------------------------------
 As discussed in #16645: (Ed25519 key backups) printing it on paper, QR
 codes, email, cloud, portable storage media, backup servers, you name it
 should all be possible for an user.

 I suggest using Base58Check encoding (it removes 0OIl chars) - makes it
 easier to re-create the key from a paper printed version of it.

 An ascii-armored version for the key files should be used by default
 regardless if the master Ed25519 key is encrypted with a passphrase or
 not.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16680>
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