Template Extraction Hooks

[lukeed]

During the extraction phase of preact create, template authors should have the ability to request/require additional information in order to scaffold a more powerful boilerplate.

This is inspired by Yeoman & Vue Cli. It would also pair nicely with #353.

Current Ideas

• Prompts
  • Required?
  • Conditional?
• Directory Struture
  • Conditional file copies
• Lifecycle hooks
  • post-install
  • pre-extraction
  • post-extraction
  • ...

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Extracted from #329 for clarity.