Better event system using ASM

[SoniEx2]

There could be a better event system with:

• Priority.
  • LOWEST, LOW, MEDIUM, HIGH and HIGHEST.
• Cancelability.
  • Being able to cancel events would be useful.
• Inheritance.
  • That is, instead of having to modify the event bus every time you wanna add a new event, you just add the new event.
• Multiple handlers for the same event.
  • You could have multiple methods with different names but listening to the same event.
• Annotations.
  • They look nice.

Example:

@EventHandler
public void onMessage(MessageEvent event) {
    // * stuff here * //
}

@EventHandler(priority=Priority.HIGHEST)
public void onBotMessage(MessageEvent event) {
    if (event.getUser().getName() == "botName")
        event.setCanceled(true);
}

[hoerup]

Interesting idea. I would like to see a PR with this