new module - waiting_for_mycroft

[JarbasAl]

since PRs are not merged we can provide some alternative imports adding functionality that mycroft refuses/takes forever implementing

this will only work for skills, not core functionality like intents

• provide a subclass for skill gui, users would need to assign this to self.gui in their initialize method
• provide a subclass for common play skill
  • my alternative skill with all unmerged PRs will replace official skill

Initial improvements to bundle

• https://github.com/MycroftAI/mycroft-core/pull/2698
• https://github.com/MycroftAI/mycroft-core/pull/2660