Event registry and subclass specification

[gdude2002]

So, it's become necessary for plugins to be able to specify event classes when registering their handlers, and to ensure that things are reloadable whilst doing this.

So! We need an event registry. That means a few things.

• Plugins should never import event classes.
• Plugins should only refer to events using strings
  • We haven't decided what they'll actually be, but we'll probably change them to class names
• There will need to be a re-registry when a module is reloaded, so specifying the module and being able to replace the currently registered events for it will be necessary

More news as it happens.

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