Use a card-based UI:

Ported from Kitat:
https://github.com/XXMrHyde/android_packages_apps_Mms/commit/8124459db5c6affb3a2340f5fd33cff953cc126a
https://github.com/XXMrHyde/android_packages_apps_Mms/commit/ba9518165270a53e3d3af7b5e6f905a6229b4faf