Release 0.18.0 highlights:

# Added

- Add `[ui].msglist-scroll-offset` option to set a scroll offset for
  the message list.
- Add new `:align` command to align the selected message at the top,
  center, or bottom of the message list.
- Inline image previews when no filter is defined for `image/*` and the
  terminal supports it.
- `:bounce` command to reintroduce messages into the transport system.
- Message counts are available in statusline templates.
- Execute IPC commands verbatim by providing the command and its args
  as a single argument in the shell.
- Virtually any key binding can now be configured in `binds.conf`,
  including Shift+Alt+Control modifier combinations.
- Configure default message list `:split` or `:vsplit` on startup with
  `message-list-split` in `aerc.conf`.
- Create notmuch named queries with the `:query` command.
- Specify a ":q" alias for quit.
- The `:detach` command now understands globs similar to `:attach`.
- Match filters on filename via `.filename,~<regexp> =`.
- Tell aerc how to handle file-based operations on multi-file notmuch
  messages with the account config option `multi-file-strategy` and the
  `-m` flag to `:archive`, `:copy`, `:delete`, and `:move`.
- Add `[ui].dialog-{position,width,height}` to set the position, width
  and height of popover dialogs.
- New `pgp-self-encrypt` option in `accounts.conf`.
- Add `--no-ipc` flag to run `aerc mailto:...`, `aerc mbox:...`, and
  `aerc :<command...>` within the current aerc instance and prevent
  listening for IPC calls from other aerc instances.
- Add config options `disable-ipc-mailto` and `disable-ipc-mbox` to
  make `mailto:...` and `mbox:...` commands always run in a new aerc
  instance.
- Set global options in `accounts.conf` by placing them at the top of
  the file.
- Silently close the terminal tab after piping a message to a command
  with `:pipe -s <cmd>`.
- New `tag-modified` hook for notmuch and JMAP accounts.
- New `flag-changed` hook.
- Notmuch search term completions to `:query`.
- Notmuch completions for `:cf`, `:filter` and `:search`.
- Add `imaps+insecure` to the available protocols, for connections that
  should ignore issues with certificate verification.
- Add `[ui].select-last-message` option to position cursor at the
  bottom of the view.
- Propagate terminal bell from the built-in terminal.
- Added `AERC_FOLDER_ROLE` to hooks that have `AERC_FOLDER`.
- Added `{{.AccountBackend}}` to templates.
- Added `AERC_ACCOUNT_BACKEND` to hooks with `AERC_ACCOUNT`.
- Per folder key bindings can now be defined for the message viewer.
- Allow using existing directory name with `:query -f`.
- Allow specifying the folder to delete with `:rmdir`.
- The address book is now used for `:cc`, `:bcc` and `:forward`.
- Allow fallback to threading by subject with
  `[ui].threading-by-subject`.

# Fixed

- Calendar responses now ignore case.
- Allow account- and folder-specific binds to coexist.
- Fixed crash when running `:send` with a `:preview` tab focused.
- Deadlock when running `aerc mailto:foo@bar.com` without another
  instance of aerc already running.
- Prevent a freeze for large-scale deletions with IMAP.
- `Mime-Version` is no longer inserted in signed text parts headers.
  MTAs normalizing header case will not corrupt signatures anymore.
- Restore previous behaviour of the new message bell which was broken
  in the last two releases for at least some setups.

# Changed

- The default `[ui]` settings and the `default` styleset have changed
  extensively. A no-color theme can be restored with the `monochrome`
  styleset.
- The default `colorize` theme has been changed to use the base
  terminal colors.
- The `[viewer]` section of stylesets now preserve default values as
  documented in `aerc-stylesets(7)` unless explicitly overridden.
- Add Message-ID to the variables of `[hooks].mail-received`.
- The `TrayInfo` template variable now includes a visual mark mode
  indicator.
- The `disable-ipc` option in `aerc.conf` completely disables IPC.
- Improved readability of the builtin `calendar` filter.
- `:open` commands now preserve the original filename.
- Unparsable accounts are skipped, instead of aerc exiting with an
  error.

# Deprecated

- Built-in descriptions for the default keybinds shown on the review
  screen will be deprecated in a future release. Descriptions can be
  added to those keybinds with inline comments in binds.conf.

Thanks to all contributors!

~$ contrib/git-stats.sh 0.17.0..0.18.0
Author                    Commits  Changed Files  Insertions  Deletions
Robin Jarry                    53            272       +2373      -1112
Tim Culverhouse                29            131       +1525      -2056
Bence Ferdinandy               17             57        +440        -64
Jason Cox                      15             59       +1031       -357
Koni Marti                     15             44        +436       -124
Karel Balej                    10             23        +735       -447
Tristan Partin                  7             14        +332        -51
Maarten Aertsen                 6              9         +35        -27
Johannes Thyssen Tishman        4             14        +116        -45
Matěj Cepl                      4              4         +16         -4
Moritz Poldrack                 4              7         +17        -10
Julio B                         3              8         +51         -7
Vitaly Ovchinnikov              3              6         +54         -7
Gregory Anders                  2              2          +5         -1
Jules Maselbas                  2              2          +9         -8
Bartkk                          1              3         +16         +0
Brandon Maier                   1              1          +2         +0
Daniel Gray                     1              1          +1         -1
Gary Kim                        1              1          +1         -1
Joey Schaff                     1              1          +1         -1
Jonathan Dowland                1              1          +1         -1
Michael Walle                   1              2          +2         -2
Nicolas Dichtel                 1              1         +14        -10
Ryan Winograd                   1              1          +2         -2
jp39                            1              1          +3         -5

Reviewer/Tester           Commits
Robin Jarry                   128
Bence Ferdinandy               25
Tim Culverhouse                14
Inwit                          11
Moritz Poldrack                 7
Koni Marti                      5
Matěj Cepl                      5
Nicolas Dichtel                 5
Maarten Aertsen                 4
Tristan Partin                  4
Jason Cox                       3
Julio B                         3
Jeremy Baxter                   2
"Matěj Cepl"                    1
Gavin-John Noonan               1
Gregory Anders                  1
Johannes Thyssen Tishman        1
Jonathan Dowland                1
Karel Balej                     1
Maximilian Bosch                1
Runxi Yu                        1
Tianhao Wang                    1
Tomasz Kramkowski               1
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