Fixed a couple of bugs in ContainerItem and Item so they compile.

Item's size property needed to be protected to be accessed from ContainerItem.
ContainerItem needed constructors.
More rooms, reciprocal links, listing adjacent rooms and CLI bug fix.

Added a room and several links between rooms.
Added reciprocal links based on known opposite directions.
Prints list of adjacent rooms alongside name and description.
Fixed bug for single word commands.