win32tty changes

1. Switch to low-level console routines for performance improvements.
2. Instead of moving the cursor around like a real tty, just track the
   destination coordinates of where the cursor should be, and
   defer the movement until user input is expected.

Credit to <Someone> for #2.

sys/share/pctty.c

@@ -75,9 +75,6 @@ error VA_DECL(const char *,s)
 	VA_INIT(s, const char *);
 	/* error() may get called before tty is initialized */
 	if (iflags.window_inited) end_screen();
-#ifdef WIN32CON
-	if (iflags.rawio) set_output_mode(0);
-#endif
 	putchar('\n');
 	Vprintf(s,VA_ARGS);
 	putchar('\n');