Document and deprecate various old, undocumented classes

These classes are mostly undocumented and, in some cases, completely
unobvious in what they do or how to use them. In some cases, I added
docs to explain the API. In other cases (ProgressDialog, ZoomButton,
DialerFilter), I deprecated the classes because there are far better ways
to accomplish that functionality with today's platform.

Issue #2164052 Underdocumented classes in Eclair

Change-Id: Ief0e7267852c2cb3c5ae604b3d902d66c89f4cd3