Allow callers to override the inlineEditor multi-line text field.
inlineEditor now works with custom text fields for multi-line text. A

caller can provide options for overriding the creation of a text field,

setting text, and getting text. Through this, it can place its own

widget (or even just a more complex object still wrapping a textarea).

Tested with a standard text area. Behavior remained the same.
Tested with a custom widget I wrapped. It worked as expected.