minify css and remove unused styles #729
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Closes #697.
With this PR, Svelte removes unused styles (only works if
cascadeis false, the soon-to-be-default). It will also remove unnecessary whitespace, saving a few bytes.It doesn't (yet! maybe one day) do more sophisticated forms of minification — the goal isn't so much to render the most compact CSS possible (which could be done in a pre- or post-processing step), but rather to take CSS minification off the list of things that most people need to worry about.