* exclude `Features.LogicalProperties` lightningcss feature
We don't want this to automatically apply since we have dedicated
logical property based utilities already.
We also have a feature flag to toggle some utilities to make use of
logical property based ones.
This feature should be opt-in to prevent backwards compatibility (e.g.:
RTL sites that _did_ use a mr-4 explicitly).
* update default browserslist
* explicitly include/exclude Lightning CSS features
* update tests based on new browserslist and include/exclude features from Lightning CSS
* update integration tests
* prefer user browserslist, fallback to built-in browserslist
* always include Nesting
If a custom browserslist config is used, then we don't explicitly set
the include/exclude features from Lightning CSS (except for nesting, we
always want to process nesting)
* ensure to fallback to the current working directory
* update changelog
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