NguyenDevs Orbital Strike Cannon

From now on, each cannon will be able to customize its own parameter values. The values in config.yml are only for mapping when creating a new default cannon.

Two new commands will be added to support the new feature.

Add /cannon set - Set a parameter for a cannon Add /cannon info - Show info for a cannon

These two commands will be updated to use actual cannons rather than creating virtual ones based on config values.

Modify /cannon fire Modify /cannon target

Added the update-notify: true option to config.yml to notify admins and the console when a new version is released.