Updates:

- Changed Event to an abstract class
- Updated Javadocs style to be more consistent with other BSPF System projects
- Version bump to 0.2.0-SNAPSHOT (from 0.1.1-SNAPSHOT)
- JetBrains Annotations update to 23.0.0 (from 21.0.1)

Update:

- Changed repository name from MCPluginEvents to PluginEvents (no functionality change)
- Replace any reference to MCPluginEvents with PluginEvents

Updates:

- PluginEvents Javadocs to explain the importance of calling PluginEvents.callEvent(Event) with the highest priority in the Bukkit/BungeeCord API event handlers for proper cancellation

- Added link to Jetbrains Annotations Javadocs