Change pasting to bypass the output key processing entirely and write
what was originally received. Fixes problems with pasted text being
interpreted as extended keys reported by Mark Kelly.

Mark keys sent by command and skip paste handling for them.

Allow send-keys without a client again, reported by Stefan Hagen.

Add send-keys -K to handle keys directly as if typed (so look up in key
table). GitHub issue 3361.

Expand arguments to some commands where it makes sense, GitHub issue
3204 from Anindya Mukherjee.

Same as -N, don't send if 0 arguments and -R.

Do not send any key if -N flag is given even if no other arguments,
fixes problem with repeat in copy mode reported by tb@.

Make send-keys without any arguments send the key it is bound to (if
any). GitHub issue 2904.

Add args parsing callback for some future work, currently unused.

Hide struct args behind a couple of accessor functions.

Break the colour palette into a struct rather than just a single array
and use that to support the OSC palette-setting sequences in popups.
Also add a pane-colours array option to specify the default

Break the colour palette into a struct rather than just a single array
and use that to support the OSC palette-setting sequences in popups.
Also add a pane-colours array option to specify the defaults. GitHub
issue 2815.

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Fix ASCII keys with send-keys -l.

Use the internal representation for UTF-8 keys instead of wchar_t and
drop some code only needed for that.

Separate key flags and modifiers, log key flags, make the "xterm" flag
more explicit and fix M- keys with a leading escape.

Recognise extended key sequences on input (both the forms xterm offers).

Send keys when they are complete not before (!= vs ==).

Make client -c and -t handling common in cmd-queue.c and try to be
clearer about whether the client is the target client (must have a
session) or not.

Move cmdq_state into cmd-queue.c.

Rename cmdq_shared to cmdq_state which will better reflect what it is
(going to be) used for.

Store a key event not a mouse event in the shared data.

Also move cmdq_item and cmdq_list into cmd-queue.c (this is to make its
use more clearly defined and preparation for some future work).

Make struct cmd local to cmd.c and move it out of tmux.h.

Some unnecessary assignments and unused variables.

Change input path so it doesn't require a pane.

Treat plausible but invalid keys (like C-BSpace) as literal like any
other unrecognised string passed to send-keys. Reported by Anthony
Sottile in GitHub issue 2049.