Add source to change events

[vorg]

Currently it's impossible to know who emitted the change in the callback

function onParamChange (name) {
  console.log('param ${name} has changed')
}

// start listening
entity.transform.changed.add(onParamChange)

// done internaly by transform whenever position changes
entity.transform.dispatch('position')

// stop listening
entity.transform.changed.remove(onParamChange)

[dmnsgn]

What about using the listenerContext param: add(listener, listenerContext, priority)

function onParamChange (name) {
  console.log('param ${name} has changed')
  console.log('From entity', this)
}

entity.transform.changed.add(onParamChange, entity)