Made the first fully-fleshed command to test "Plan A"

Plan A is to use TourneySquireMessage objects passing between members
to help set up tournaments. Ping-Pong should help test the foundations
of this framework.
Updating AAction docs. Subclasses of AAction should now be singletons.
Fixed bug. Forward slash /ts in order to access commands.
Added TODO: Include notion of "tournament host"

Host is the admin holding the actual tournament data in their clint.
Future work should allow copies of this data to exist under other
admins as well.