Strip carriage returns (^M) when filtering emails

Presumably some email servers will transform newlines into carriage
return new lines to better support windows users. I can't prove this but
that's the best explanation I have for my hosted email provider
(fastmail).

Without this patch, I was seeing annoying `^M`s at the end of every
filtered line.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>

Only compile regex portion of folder filter

The code was trying to compile the `~` as well. In this case, it was
trying to match a literal `~` to the front of the supplied regex.

Fixes: 334ca89bea381 ("folder filter: only assume regex if filter is
~fmt")

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>

folder filter: only assume regex if filter is ~fmt

Add forwarding as attachment feature

This allows a single message to be forward as attachment with the
:forward -a command

Add addresses argument to forward command

Move forward command to it's own file

The two commands did not have much code in common

upgrade go-message

Fixes date parsing bug in the maildir / notmuch workers.

Add support for <C-j> as '<Enter>' in ExLine

Support regex filters for folders

It's nice to be able to filter the folders displayed in the side
bar. Basic string matching can get verbose with enough folders
whitelisted.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>

bump go-message, fixes address list parsing failure

Revert "add close command at global level"

This reverts commit f0a0c5aa733fa66958c113465bfc5fdd3d7cc9f0.

add close command at global level

Add optional body argument to compose command

Prevent drawing terminal with nil cmd

Add delete forward <C-k> and backward <C-u>

Choose the readline defaults for the behavior of these two
functions/keybindings. Depending on the program, either of these can
delete the whole line.

Note that by default in [compose], <C-k> is bound to :prev-field<Enter>.
Leave it up to the user whether or not they want to rebind the key in
[compose].

Joining the args in cf for folders with spaces
f6df46d3 — Jonas Mueller 17 days ago 
Pass os stdin to credential command

This is neccessary for `gpg-agent` to display a prompt and get the key
to unlock a given password. See https://todo.sr.ht/~sircmpwn/aerc2/250.

Ignore scroll command when msgstore is nil

Fixes ~sircmpwn/aerc2#205. Many functions do a nil check on the store,
so this changes Store() so it returns nil when msglist is nil.

It also places the Scroll() behind the nil check in the next-message command.

https://todo.sr.ht/~sircmpwn/aerc2/205

Let user edit arbitrary headers in composer

maildir: Preserve flags when copying messages
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