* fix --help output in tests
* add tests to ensure we can use `purge.safelist`
* implement the `purge.safelist` for strings
* proxy `purge.safelist` to `purge.options.safelist`
This allows us to have a similar API in `AOT` and `JIT` mode.
* only proxy `purge.safelist` to `purge.options.safelist` if
`purge.options.safelist` doesn't exists yet.
* remove unused file
using syntax.js instead
* add a way to remove files that are generated from the tests
Essentially setting the restore cache contents to `null` as a special
value.
* combine the stdout and stderr output
* add jest-diff instead of relying on it existing *somewhere*
This also came with a small API change.
* add `--runInBand` to the test script
* add dedicated cli tests for the new Tailwind CLI