linenoise: get rid of globals; everything in struct.

* linenoise/linenoise.c (completion_callback, orig_termios,
rawmode, mlmode, history_max_len, history_len, history): Global
variables removed; moved into struct lino_state.
(struct lino_state): New members next, prev. New members
completion_callback, orig_termios, rawmode, mlmode,
history_max_len, history_len, history.
(lino_list): New static variable: dummy node for circular
list of struct lino_state structures.
(lino_set_multiline): Operate on structure rather than global
variable.
(enable_raw_mode, disable_raw_mode): Operate on structure. Use
file descriptors from structures rather than inconsistent
hard-coded use of STDIN_FILENO and the argument fd, which is
gone.
(lino_clear_screen): Obtain file descriptor from structure,
rather than global.
(complete_line): Operate on structure rather than globals.
Pass context to completion callback.
(lino_set_completion_cb): Store callback in structure rather
than global. Store new context argument also.
(reresh_line): Take mode from structure rather than global.
(edit_insert, edit_move_end): Operate on struture rather
than globals.
(edit): Do not accept file descriptor arguments.
Do not update ifd and ofd members of structure; just rely on these
values to already be there, since the lino_make constructor
puts them there.
(lino_print_keycodes, go_raw): Operate on structure.
(lino_make, lino_free): New functions.
(lino_cleanup): New static function.
(linenoise, free_hist): Operate on structure.
(atexit_handler): Loop over all structures in global list,
and clean up each one.
(lino_hist_add, lino_list_set_max_len, lino_hist_save,
lino_hist_load): Operate on structure.

* linenoise/linenoise.h (lino_t): New typedef.
(lino_compl_cb_t): Function type takes new context argument.
(lino_set_completion_cb, linenoise, lino_hist_add,
lino_hist_set_max, lino_his_save, lino_hist_load,
lino_clear_screen, lino_set_multiline,
lino_print_keycodes): Declarations updated.

* linenoise/example.c (completion): Take new context argument,
and ignore it.
(main): Create linenoise context with lino_make, giving it
the input and output file descriptor, and pass it to all functions.

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