ncurses interface:

 * support colors if --color is enabled (it is by default)
 * use _() to permit translation of the interface
 * matches only ESC, and not special keys combinations (it was boring to have VLC exit when inadvertently hitting alt+something
 * do not use KeyToUTF8() at all when in wide characters mode, since we assume UTF-8 locale
 * display the help shortcut when the interface is stopped, rather than in the title
Patch by funman.