code: function CodeManager (_traceManager) {
    this.event = new EventManager()
    this.isLoading = false
    this.traceManager = _traceManager
    this.codeResolver = new CodeResolver({web3: this.traceManager.web3})
  }
docs: /*
  resolve contract code referenced by vmtrace in order to be used by asm listview.
  events:
  - changed: triggered when an item is selected
  - resolvingStep: when CodeManager resolves code/selected instruction of a new step