add 'output.stdout', '.stdin', and '.stderr' options

(#1621, #2152, #2529)

Allow setting custom input/output encodings and options
without having to rely on Python's defaults.

gallery_dl/__init__.py

@@ -33,9 +33,6 @@ def progress(urls, pformat):
 
 def main():
     try:
-        if sys.stdout and sys.stdout.encoding.lower() != "utf-8":
-            output.replace_std_streams()
-
         parser = option.build_parser()
         args = parser.parse_args()
         log = output.initialize_logging(args.loglevel)
@@ -77,6 +74,8 @@ def main():
         for opts in args.options:
             config.set(*opts)
 
+        output.configure_standard_streams()
+
         # signals
         signals = config.get((), "signals-ignore")
         if signals: