feat(format): expose formatting utils in new formatcore package

[bastantoine]

This allows to use them when defining a custom formatter outside of the format package.

This should fix #38.

[princjef]

As I look at this, I'm wondering if it makes more sense to put the base functions in a subpackage to separate it out from the individual formatters. I'm thinking something like format/formatcore/base.go, which means you'll invoke as formatcore.Bold, formatcore.Header, etc.

What do you think?

[princjef]

Looks like the linter failed. Can you take a look into the failures (mage lint) and also generate the markdown documentation once you're done (mage doc)

[bastantoine]

As I look at this, I'm wondering if it makes more sense to put the base functions in a subpackage to separate it out from the individual formatters. I'm thinking something like format/formatcore/base.go, which means you'll invoke as formatcore.Bold, formatcore.Header, etc.

What do you think?

Yes I agree, now that those functions are available outside it seems legit they get their own package. I'll do the move.

[princjef]

LGTM, just the one comment about moving the file. Thanks for taking the time to put this together!