• Use Websocket connection instead of raw HTTP connection for connection to MatterBridge API (fixes #6)

• Fixed check whether advancement should be sent to Matterbridge
• Removed requirement of explicitly providing a list of advancements (advancements.yml)

Note: The plugin now requires at least Minecraft 1.19 as the new features depend on a feature only available since 1.19.

Updated list of advancements from https://minecraft.gamepedia.com/Advancement to add those added in Minecraft 1.19 (thanks to @Millesimus)