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Improved watching with chokidar (#3980)

Improved watching with chokidar.
This change improves the file watching behavior and fixes #3912.

* We introduce the `--watch-files` command line option. This option
  allows control over which files are and is separate and more powerful
  than `--extension`. Fixes #2702.
* We introduce the `--watch-ignore` command line option that allows
  control over which files are not watched. Before this was hardcoded to
  `node_modules` and `.git`. See #2554.
* The `chokidar` package now handles file watching.
* New test files are picked up by the file watcher and run. Fixes #2176.
* Watch hidden files based on extension

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