Make FormItem more flexbile

Steps to reproduce:
1. Build a form item
2. Give it a label.
3. Give the form item some children.
4. Decide you'd like to see the label rendered anywhere than on the left of your form item's children
5. Run your application and notice that there's no easy way to put your form item's label anywhere but on the left of it's children.
6. Feel frustrated.
7. Try some other things, like using the "label" component for your label, and giving your form item no label.
8. Notice that the "formItem" renders space for it's label regardless of whether any label is actually set.
9. Repeat 6.

Actual Results:
Frustration

Expected Results:
Elation

Workaround (if any):