Make command dispatching process clearer

config.py

@@ -1,6 +1,7 @@
 config = {
     'fallback_command': 'natural_language.process',
-    'command_start_flags': ('/', '／', '来，', '来,'),
+    'fallback_command_after_nl_processors': 'core.tuling123',
+    'command_start_flags': ('/', '／', '来，', '来,'),  # add '' (empty string) here to allow commands without start flags
     'command_name_separators': ('\.', '->', '::', '/'),  # Regex
     'command_args_start_flags': ('，', '：', ',', ', ', ':', ': '),  # Regex
 }