Toot

* TUI: Add workaround for issue with snac2 instances (523)

This release adds a new set of commands for working with timelines under
`toot timelines` (note the plural). These will replace `toot timeline`
which is now marked as deprecated. The reason for this change is that
various timelines require different options and having separate commands
makes them easier to implement and use.

New timeline commands include new paging logic which will print as many
statuses as can fit on your screen at once, and clear the screen before
printing the next batch. See help for `--pager` and `--clear` options.


* BREAKING: Remove deprecated commands: `tags_followed`, `tags_follow`, and
`tags tags_unfollow`. Use `tags followed`, `tags follow`, and `tags tags
unfollow` instead.
* BREAKING: Remove deprecated `lists` command for listing lists in favour of
`lists list`
* Add `toot timelines` commands and mark `toot timeline` as deprecated
* Improve datetime parsing, improves compatibility with snac2 (523)
* TUI: Fix urwid deprecations (thanks Aleksei Stepanov)

* Fix last post ID not being stored when using --json, which broke --reply-last
* Don't set default post visibility to public, let the server decide instead

* Add `toot tui --show-display-names` option to show display names instead of
account names (501)
* Add missing descriptions for notification types (502)
* Fix bug in paging timelines where limit parameter was sent twice (505)
* TUI: Fix exception when loading followed accounts when server does not support
it (504)

* Add `--limit` and `--offset` options to `search` command (thanks Oblomov)
* Add `--min-id` and `--max-id` options to `search` command
* Add `--type` and `--exclude-type` options to `notifications` command
* Fix bug when identifying lists by their ID

* Add `post --reply-last` for replying to last posted toot, for creating threads
* Deprecate `env` command in favour of `diag`