Update to JDA 5.6.1, Add YouTube OAuth2 support, Transform sources, and expanded audio managers

[ahson01]

This PR extends JMusicBot with optional YouTube OAuth2 login, a transformable source mechanism, and additional audio source managers. It also updates dependencies and documents the fork-specific changes.

Key Changes

• YouTube OAuth2 integration
  • Toggle via youtubeoauth2 in config.txt.
  • Captures OAuth flow from logs and persists refresh token to youtubetoken.txt.
  • Uses stored token to authorise the YouTube source on startup.
• Transformative sources
  • New transforms section in config to rewrite inputs into playable sources.
  • TransformativeAudioSourceManager loads transformed inputs using selectors and formatting.
• Expanded audio sources
  • Registers DuncteBot source managers and several additional lavaplayer managers.
• Config/UI/Boot wiring
  • BotConfig loads youtubeoauth2 and transforms.
  • Bot wires a YoutubeOauth2TokenHandler into logback to intercept OAuth messages.
  • reference.conf documents new options and defaults.
• Documentation
  • README.md updated with fork notice and OAuth instructions.

Files Touched

• Config and startup
  • src/main/java/com/jagrosh/jmusicbot/BotConfig.java: load youtubeoauth2 and transforms.
  • src/main/java/com/jagrosh/jmusicbot/Bot.java: initialize YoutubeOauth2TokenHandler.
  • src/main/resources/reference.conf: add youtubeoauth2, transforms, and explanatory comments.
• Audio stack
  • src/main/java/com/jagrosh/jmusicbot/audio/PlayerManager.java: register transforms, YouTube OAuth2, and new source managers.
  • src/main/java/com/jagrosh/jmusicbot/audio/TransformativeAudioSourceManager.java: new manager for input rewrites.
  • src/main/java/com/jagrosh/jmusicbot/utils/YoutubeOauth2TokenHandler.java: logback TurboFilter to handle OAuth flow and token persistence.
• Docs and build
  • README.md: fork/OAuth notes.
  • pom.xml: dependency updates and repositories.

Configuration

• New/updated properties in config.txt:
  • youtubeoauth2 (boolean, default false)
  • transforms (object, default {})

Dependency Updates

• JDA: 5.6.1
• lavaplayer: 2.2.4
• dev.lavalink.youtube:common: 1.13.5
• com.dunctebot:sourcemanagers: 1.9.0 (excludes legacy YouTube artifacts)
• com.github.jagrosh:JLyrics: master-SNAPSHOT
• Adds necessary repositories (dv8tion, jitpack, lavalink, etc.).

Checklist

• Compiles locally and via CI
• Backwards compatible defaults
• Docs updated (README.md, reference.conf)
• No breaking API changes for commands

[Sartharon]

JDA 5 requires intents to be explicitly enabled
Thus you are missing, otherwise you will not be able to read any content or members
.enableIntents(GatewayIntent.MESSAGE_CONTENT, GatewayIntent.GUILD_MEMBERS)