* Four prototypes: (#4382)
Two have manual layout and two have auto layout.
Two have configurable supporting views, two don't.
* Manual Layout prototype 3
* Fix project by adding initial List Item Cell Demo
* Add other List Item example
* Make view properties readonly and make cellWidth private
* Make cellWidth public again and make more efficient
* Rename MDCListItemCell to MDCBasicStereoCell
* Rename to MDCSelfSizingStereoCell
* Small nits
* Set cellWidth in preferredLayoutAttributes
* Some Jeff feedback
* Extract layout code
* Delete all the prototypes from forever ago
* Fix copyright messages
* Get rid of __IPHONE_11_0 checks
* PR feedback
* Move layout to its own file
* Add dependencies
* Tweak documentation
* Fix copyright stanzas
* Clang format
* Move numberOfLines logic to cell
