Eliminate duplicate code and ease the passage for server-wide options by adding
a -w flag to set-option and show-options and making setw and showw aliases to
set -w and show -w.
Note: setw and showw are still there, but now aliases for set -w and show -w.
Add a -p flag to display-message to print the output rather than displaying in
the status line, this allows things like "display -p '#W'" to find the current
window index.
Change status line drawing to create the window list in a separate screen and
then copy it into the status line screen. This allows UTF-8 in window names and
fixes some problems with #[] in window-status-format.
Two new options, window-status-format and window-status-current-format, which
allow the format of each window in the status line window list to be controlled
using similar # sequences as status-left/right.
This diff also moves part of the way towards UTF-8 support in window names but
it isn't quite there yet.
Revert to xterm-keys off by default. It was on as an experiment to see if the
option could be removed, but it affects vi, so we have to keep the option, and
a conservative default is better.
Cleanup by moving various (mostly horrible) little bits handling UTF-8 grid
data into functions in a new file, grid-utf8.c, and use sizeof intead of
UTF8_DATA.
Also nuke trailing whitespace from tmux.1, reminded by jmc.
Add a per-client log of status line messages displayed while that client
exists. A new message-limit session option sets the maximum number of entries
and a command, show-messages, shows the log (bound to ~ by default).
This (and prompt history) might be better as a single global log but until
there are global options it is easier for them to be per client.
Permit top-bit-set characters to be entered in the status line. They could
already be set from the shell and are just passed through when printing (so
invisible characters or displaying on terminals with different character sets
may cause problems).
Note that entering UTF-8 may not work and in any case currently the status line
cannot display it correctly (outside of status-left/status-right).
