feat: add variable resolution to components

[elevatebart]

In regards to @JessicaSachs request, I add a simple variable resolution to the exported components so that the following patterns will work

const component = {
  name:'myComp'
}

export default myComp

@Component
class myComp extends Vue {

}

export default myComp

[vue-styleguidist-bot]

🎉 This PR is included in version 3.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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