Move the keycode_company, printable_map_val, chtype_map_val,
keycode_game_move, printable_game_move and chtype_game_move global
variables to intf.c and intf.h.
Convert all input routines, and most internal strings, to use
wide-character functions. All extended characters are supported,
including those having column widths of zero (eg, combining characters),
one (eg, normal Western characters) and two (eg, many East Asian
characters). This was quite a major undertaking!
Rework the signal handler to be somewhat more unsafe, but conceptually
cleaner, in operation. It now ends the use of Curses, then reraises the
signal. Remove almost all references to abort_game.
Add a signal handler for SIGINT and SIGTERM, as well as sprinklings of
checks to abort_game. Although Ncurses DOES define handlers for SIGINT
and SIGTERM, they do not always seem to work correctly under many
operating systems.
Some versions of getopt_long() show ALL options if an ambiguous
abbreviation was supplied (such as "--no"), and we don't really want
players to discover this option by accident, do we? :-)
Rename the global array variables map[] and move[] to galaxy_map[] and
game_move[] respectively to prevent clashes with functions from various
libraries (particularly NCurses).
