Setup event callbacks before init

[mucaho]

Setup event callbacks defined in the events object before calling
the init method in component and system definition.
This allows triggering bound callbacks in the init method.

see #1126

[starwed]

I guess the big question is, are there any common use cases where you want to bind events after the init function?

I can't really think of any, and I think binding events before running init is the least surprising order. You can always explicitly bind events at the end of init if that's what you really want.

[mucaho]

You can always explicitly bind events at the end of init if that's what you really want.

Good point, workaround is available if needed.