ENHANCEMENT - Update Notifier

[Jake-Moore]

• It should be easy to add a startup message (for modules spigot-jar and spigot-utils that have an onEnable method) that checks the GitHub Gist (from the CI). It then sends a console message alerting for updates. It should not check if the current version is a snapshot, or send a message if the current is newer.
• There should be a second message to better indicate changes to the major version. The first message is about if the current major version branch is up to date, and this second message only alerts if a new a major release update exists, and migration is recommended.
  • This may require the Gist JSON being updated with more versioning data.