Fix SC.TextFieldView to insert a new line when the enter key is press on a text area

A fix were already there for the SC.InlineTextFieldView class so I copy
it into the TextFieldView class. I've updated the
SC.InlineTextFieldView class so that it now call the super class in the
case where it is a text area.

I've also removed some useless code in the InlineTextFieldView class:
- A fix in the insertNewline method which is not needed anymore
- The method fieldValueDidChange which only call the super class
If SC.TextFieldView is not a text area, let the next responder handle the event
Small fix with the method layoutChildViewsIfNeeded
Some actions need to be always handle by a TextFieldView when it has the focus

If a parentView of a TextFieldView handle deleteForward deleteBackward,
moveLeft, moveRight, selectAll, moveUp or moveDown, the event will not
be mapped to the TextFieldView.