Teach sg-insert to include components with modifiers

[kraftner]

see #784

[kraftner]

Sorry for the mess. I'll create an new clean PR once this is ready to go in.

But first I'd need some feedback if this is working for you.
Also I'd like to add this to the test coverage but not really sure were to start.

[Grienauer]

+1

[varya]

Looks good. I would also add the tests about this case in here https://github.com/SC5/sc5-styleguide/blob/master/test/unit/modules/section-references.test.js

[kraftner]

So, this is the first time I've written a JS test, hopefully it is useful 😄

If this all looks good to you I can create a new, clean PR if you don't want to merge all this separate commits.

[varya]

Yes, sure. I'll merge the new one.

[kraftner]

Okay this finally made me get into the magic realm of rebasing and force-pushing.

I think this is now ready to be merged.

[varya]

Thank you very much!

[kraftner]

Thank you for everything else!

You can also close #784 now.