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- Add two new options, keyfile and certfile, which must be both set for
  the auth to work.
- if both are set, then poezio doesn’t force-prompt a password if there
  is none specified
- add /cert_add, /cert_fetch, /cert_disable, /cert_revoke and /certs
  commands.
- add a page of documentation on the process

fix #2841

- Add two new options: tmp_image_dir and extract_inline_images
- tmp_image_dir is $XDG_CACHE_HOME(usually ~/.cache)/poezio/images if unset
- Name the images from a SHA-1 of their data and their mimetype
- Output file:// links inside the message

this option determines if the non-autojoin bookmarks will
be opened on startup or not.

It is false by default.

Because SHA-1 is not really relevant anymore.
Too bad it's significantly longer and tiring to check, even if that is
to be expected.

- two options request/ack_message_receipts
- two new theme parameters : CHAR_ACK_RECEIVED and COLOR_CHAR_ACK
- if a message has a receipt, the character is displayed between the
  timestamp and the nick, using the color

- add some formatting and links (also, typos)
- link the Theme class from the theming page

and sets the default value to false, to keep coherent with the code.

- add a show_composing_tabs option, default value: "direct"
- todo: find a nice different color for this

sort the configurations options by theme
make the sidebar fixed

And put reasonable defaults

Add a force_encryption option set to true by default.

- log_errors option, true by default
- errors go in log_dir/errors.log (so $XDG_DATA_HOME/errors.log
    by default)

This should help a lot for debugging, and provide a way for people
to easily give debug traces without useless or personal infos.

Added a configuration option and some theme variables.

add two new options:
connection_timeout_delay and connection_check_interval

- Add an option enable_carbons (defaults to false)
- Make a disco on non-roster entites to determine if the message
  commes from a muc private chat or not.

Also fix the copy of the default config if -f is used