[record] Custom Client-ID and integrated OAuth

[TheDrHax]

Instead of using Twitch's OAuth token, we can create our own. It would be enough for detecting stream and live VOD, but streamlink would still require first-party token, that can be configured separately.

• Add custom Client-ID support to allow users to specify their own Client-ID - OAuth token pairs;
• Create Client-ID for this script;
• Implement OAuth implicit code flow;
• Add global configuration file and store token in it;