Import

[yoshuawuyts]

Testing imports relies on global: true functionality to exist; as else the import will just be prefixed - which is no good for anyone.

• fix plugin test
• write import functionality
• write tests for imports
• write global: true functionality
• test global: true functionality

[yoshuawuyts]

I feel the internals might be getting slightly messy - style-deps could probably use a couple of additions - but that's ok for now, I have a feeling the external contract is solid, we can always refactor afterwards. Goal for now is to release v4 asap

[yoshuawuyts]

Cool! So this PR should now resolve css packages from npm correctly (extract to separate module afterwards), and add the { global: true } flag for imports. Effectively implements #35 and what was #36 ✨

[yoshuawuyts]

It goes without saying that this should massively be refactored afterwards - there's some questionable stuff going on, but at least we're hitting the functionality we want (':

[yoshuawuyts]

Tests are passing so I'm just going to merge away. Will ask for a final review round for a v4 release, but eh - if it works I merge - till then