Add -A (capital a) option to enable alternate/ASCII arrow symbol mode

The CP437 character characters used for the arrow indicators aren't always
mapped to the expected characters in all fonts (e.g. on Windows), so add an
option to use ASCII alternatives (<>^v) when that's a problem.

src/sbbs3/scfg/scfg.c

@@ -380,6 +380,7 @@ int main(int argc, char **argv)
 	int 	i,j,main_dflt=0,chat_dflt=0;
 	char	cfg_fname[MAX_PATH + 1];
 	BOOL    door_mode=FALSE;
+	BOOL	alt_chars = FALSE;
 	int		ciolib_mode=CIOLIB_MODE_AUTO;
 	char	compiler[32];
 
@@ -491,6 +492,9 @@ int main(int argc, char **argv)
 							goto USAGE;
 					}
 					break;
+				case 'A':
+					alt_chars = TRUE;
+					break;
                 case 'v':
                     textmode(atoi(argv[i]+2));
                     break;
@@ -526,6 +530,7 @@ int main(int argc, char **argv)
 #endif
 						"       A = ANSI mode\n"
 						"       D = standard input/output/door mode\n"
+						"-A  =  use alternate (ASCII) characters for arrow symbols\n"
                         "-v# =  set video mode to # (default=auto)\n"
                         "-l# =  set screen lines to # (default=auto-detect)\n"
 						"-y  =  automatically save changes (don't ask)\n"
@@ -621,6 +626,12 @@ int main(int argc, char **argv)
 		}
 		ciolib_settitle("Synchronet Configuration");
 		i=uifcini32(&uifc);  /* curses/conio/X/ANSI */
+		if(alt_chars) {
+			uifc.chars->left_arrow = '<';
+			uifc.chars->right_arrow = '>';
+			uifc.chars->up_arrow = '^';
+			uifc.chars->down_arrow = 'v';
+		}
 	}
 	else
 		i=uifcinix(&uifc);  /* stdio */