Allow configuring multiple fields for a section at once

[codealchemy]

This allows passing an array of field names to the configure block to simplify configuring multiple fields that share the same settings within a section.

Closes #2667

[mshibuya]

#field should accept multiple names as well, since a usage like this also makes sense:

config.model Team do
  field [:name, :players]
end

[codealchemy]

#field should accept multiple names as well

Thanks for the feedback, though I'm not sure I follow. #fields is available and (unless I'm missing something) can be used to effectively do the same thing as you're suggesting (ref, doc example).

[mshibuya]

Ah I didn't realize the #fields. That makes sense, thanks!