Make the check if printing is allowed the same as writing which is less
confusing.

If a pane is killed, cancel reading from the file. GitHub issue 3422.

Check for NULL returns from bufferevent_new.

Do not double free expanded path in source-file, also remove some
unnecessary assignments.

Fire check callback after cleaning up event so it does not get stuck,
from Jeongho Jang in GitHub issue 2695.

Do not care about the server socket closing if exiting anyway.

Add a couple of helper functions, and flush imsgs on exit.

Move file handling protocol stuff all into file.c so it can be reused
more easily.

Pass the stdout file descriptor from the client as well as stdin and use
them for control clients directly instead of passing everything via the
client.

imsg.h needs uio.h, pointed out by deraadt

If /dev/fd/X is a symlink and realpath() expands symlinks, /dev/fd/X
ends up pointing to the wrong place before it is passed to the client.
The path is only used internally so there is no real need f

If /dev/fd/X is a symlink and realpath() expands symlinks, /dev/fd/X
ends up pointing to the wrong place before it is passed to the client.
The path is only used internally so there is no real need for
realpath(), remove it and move the get_path function to file.c where all
the callers are.

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Need to include message size in the maximum buffer calculation.

Instead of using large buffers in imsgs, add the data or path onto the end.

Do not check if client is dead if it is NULL.

Rewrite the code for reading and writing files. Now, if the client is
not attached, the server process asks it to open the file, similar to
how works for stdin, stdout, stderr. This makes special fil

Rewrite the code for reading and writing files. Now, if the client is
not attached, the server process asks it to open the file, similar to
how works for stdin, stdout, stderr. This makes special files like
/dev/fd/X work (used by some shells). stdin, stdout and stderr and
control mode are now just special cases of the same mechanism. This will
also make it easier to use for other commands that read files such as
source-file.

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