* replace `env.OXIDE` with global `__OXIDE__`
This will allow us to replace the `__OXIDE__` at build time, and fully
remove the branches from the final code so that there is not even any
reference to `@tailwindcss/oxide` on the stable engine.
* update changelog
* use `env.ENGINE` in integration tests
* drop oxide branching for the PostCSS plugin for now
This is currently a redirect to the same file, so doesn't hurt.
* Enable better dead-code elimination
* Update CLI tests
Fix indentation
* Fix indentation
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Co-authored-by: Jordan Pittman <jordan@cryptica.me>
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