Restrict watched nodes to configured nodes

[LukasHechenberger]

Currently, nodes that are not pulled are watched for changes when running atscm watch. This may not be an error but it's pretty confusing.

Example

Run atscm watch with a config like this

// Atviseproject.js
import { Atviseproject } from 'atscm';

/** atscm configuration of atscm-ts-sample. */
export default class AtscmTsSample extends Atviseproject {
  ...

  static get nodes() {
    return [new NodeId('SYSTEM.LIBRARY.PROJECT.SERVERSCRIPTS.SampleScript')];
  }
}

When you change one of the nodes watched by default (e.g. AGENT.DISPLAYS.Main) in atvise builder, the change is recognized and the node is pulled.