Refactor annon innner classes to own files.
Server can list active displays, creating and managing display if
needed.
JavaDoc.
JavaDoc.  Org imports.
TODO comment.
Move Screen classes into new bundle '..screen'.
Fix JavaDoc.
Just 'cos there is no videoParent now does not mean one will not turn up
later.
Log when container.setPlayer() fails.
Logger should be private.
Initial impl of server able to go full screen when display is available.