Feature/#8 imported fieldsets

[Lenitr]

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For #8, I first tried simply adding some fixes so the fieldsets will be ignored.

I'm not entirely familiar with the codebase of Statamic yet, but I figured out with a bit of trial and error to actually fetch the fields that are set in the fieldsets and map them as well, so factory for fieldsets can also be supported.

I tried reusing the same recursive structure you already made, so if there's any special fields used within a fieldset it should still work as it used to (like a Replicator field within a fieldset for example).

[aerni]

I've given this a closer look and I think this should to be approached from a different angle. I started working on a bigger refactor.

[Lenitr]

How's it going so far? Running into any issues?

[aerni]

I started working on the refactor. But haven't had time to complete it. If you can't wait, you can always pull this PR into your project in the meantime.

[Lenitr]

Ok good to know, take your time.

I already pulled the code in my own project, so I'm not in a hurry, no worries ;)

[aerni]

Imported fieldsets will work with the next major release.