Instead of opening tuntox buffer, use messages

See merge request qhong/crdt.el!4

The *Tuntox Proxy* buffer is mostly useful to those who know about the
low-level operation of crdt.el. So, instead of always opening that
process buffer when it is created, leave the process buffer in the
background and use process filters to post more user-friendly
notifications about tuntox connection status to *Messages*.

I'm not that familiar with process filters, but I saw that overriding
the default filter causes the buffer to no longer get updated by
default, so I copied the way the crdt-connect tuntox filter writes to
the process buffer into crdt-new-session as well.

Co-authored-by: Arte Ebrahimi <arteebrahimi@gmail.com>

Add `crdt-switch-to-buffer`

See merge request !3

between shared buffers, as an alternative to selecting a buffer from
the buffer list buffer.

- add crdt-toggle-override-command
- fix network coding, always use utf-8

feat: Option to put tuntox password in copied URL

See merge request qhong/crdt.el!2

Check if the process-mark is non-nil and if mark-pos is non-nil to prevent errors

See merge request qhong/crdt.el!1

** DONE Track authorship in-buffer via properties
   ~crdt-visualize-author-mode~ UI
** DONE Make interactive changes to crdt-version and crdt-connect
** DONE Stop leaking ip address
** DONE Investigate why xref-find-definitions causes error
** DONE Figure out the code for colouring selection colours from
   ‘default’s :background

- gracefully degrade when TLS handshake fail (I hope it works)
- remove session name settings

also remove some debug printing

commit a80f73d8
Merge: 20ff83c8 2eddf967
Author: Qiantan Hong <qhong@mit.edu>
Date:   Fri Oct 1 15:34:50 2021 -0700

    Merge branch 'master' of code.librehq.com:qhong/crdt.el

commit 20ff83c8
Author: Qiantan Hong <qhong@mit.edu>
Date:   Fri Oct 1 15:34:07 2021 -0700

    fix a bug in buffer remove handler