GalleryClient now does the heavy lifting and calls back to GalleryList or
any UI object. GalleryClient has most gallery rpc calls at least partially
implemented

Change-Id: I78d3273448ee6b4d030c1ca4612673a097fa2cc7
Gallery client code and a start at loading .aia files

Change-Id: I6629e55fbc9534d2a6d16db53072c143aaadfcbc
gallery client update

Change-Id: Id155c2382d7cf64378c2c37a95df7da32723de70
Set up initial GUI for gallery list page