Standardized Events

[colin-axner]

There needs to be an event specification to improve interoperability between IBC implementations from the relayer point of view. Not sure if this has already been opened as an issue, but thought I'd open one just in case it hasn't.

It'd be good to prioritize this discussion since the event system currently being used in the SDK/Tendermint combo is sub-par and there is active discussion in how to refactor it. Events are a core component of IBC functioning, almost like pipes in a building, and we should ensure they are stable and well designed.

The initial idea for typed events sounds good, but it seems to be a little hacky in practice. Things I'm unsure of:

• does the event spec use the ABCI format to specify events?
• are we defining the events as proto types?
• should we define event system requirements (and does the SDK meet these requirements)?

[mpoke]

Closing this issue in favor of #606