Replace ZRMA with ZeroBanner+JsonConfig on labs

* Added JsonConfig and ZeroBanner extensions to LABS ONLY
* Added configuration blocks for ZeroBanner
* Enabled ZeroBanner on LABS MOBILE ONLY
* Updated mobile.php to dynamically determine which class to use

Change-Id: I89ecce6bcc9bf43cb440fb95542f77b8464b7e9f
Merge "Replace ZRMA with ZeroBanner+JsonConfig on labs"