Add a separate mode struct for the active window mode if any.

Pass window into mode functions.

Add -Z flag to choose-tree, choose-client, choose-buffer to
automatically zoom the pane when the mode is entered and unzoom when it
exits, assuming the pane is not already zoomed. Add -Z to the defau

Add -Z flag to choose-tree, choose-client, choose-buffer to
automatically zoom the pane when the mode is entered and unzoom when it
exits, assuming the pane is not already zoomed. Add -Z to the default
key bindings.

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Support mouse on preview in tree mode.

Make the mode draw function use the parent screen directly rather than
its own to avoid copying twice.

Add P key to paste tagged in buffer mode, and trim some code that should
no longer be necessary.

Add -F to choose-tree, choose-client, choose-buffer to specify the
format of each line, as well as adding a couple of formats needed for
the default display.

Extend filters (f key) to buffer and client mode and add -f flag to
specify to command.

Add -O option to choose-* to set initial sort order.

Default sort for buffer mode should be time not name.

Return 1 if name matches not 0, also fix some spaces.

Add simple searching (C-s and n) to the various choose modes: by name
for client and tree, and by name and content for buffer.

Style and spacing nits.

Need time.h.

Rewrite of choose mode, both to simplify and tidy the code and to add
some modern features.

Now the common code is in mode-tree.c, which provides an API used by the
three modes now separated into wi

Rewrite of choose mode, both to simplify and tidy the code and to add
some modern features.

Now the common code is in mode-tree.c, which provides an API used by the
three modes now separated into window-{buffer,client,tree}.c. Buffer
mode shows buffers, client mode clients and tree mode a tree of
sessions, windows and panes.

Each mode has a common set of key bindings plus a few that are specific
to the mode. Other changes are:

- each mode has a preview pane: for buffers this is the buffer content
(very useful), for others it is a preview of the pane;

- items may be sorted in different ways ('O' key);

- multiple items may be tagged and an operation applied to all of them
(for example, to delete multiple buffers at once);

- in tree mode a command may be run on the selected item (session,
window, pane) or on tagged items (key ':');

- displayed items may be filtered in tree mode by using a format (this
is used to implement find-window) (key 'f');

- the custom format (-F) for the display is no longer available;

- shortcut keys change from 0-9, a-z, A-Z which was always a bit weird
with keys used for other uses to 0-9, M-a to M-z.

Now that the code is simpler, other improvements will come later.

Primary key bindings for each mode are documented under the commands in
the man page (choose-buffer, choose-client, choose-tree).

Parts written by Thomas Adam.

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