Feature/refactor-apps-string-parsing (#1152)

* Added bacnet_str functions for parsing various numeric strings.

* Renamed BACnet string API to be clearer when no stdlib function exists.

* Fixed  incompatible types - from 'BACNET_UNSIGNED_INTEGER *' to 'unsigned long *'  warning

* Changed bacnet-str-to functions to use ERANGE for error detection.

* Refactored some apps to use common string parsing for BACnet data types.

* Refactor bacapp_parse_application_data to use bacnet_string_to_unsigned for better clarity

* Added strtol for BACnetEventType.

apps/whois/main.c

@@ -383,7 +383,10 @@ int main(int argc, char *argv[])
             }
         } else if (strcmp(argv[argi], "--dnet") == 0) {
             if (++argi < argc) {
-                dnet = strtol(argv[argi], NULL, 0);
+                if (!bacnet_strtol(argv[argi], &dnet)) {
+                    fprintf(stderr, "dnet=%s invalid\n", argv[argi]);
+                    return 1;
+                }
                 if ((dnet >= 0) && (dnet <= BACNET_BROADCAST_NETWORK)) {
                     global_broadcast = false;
                 }