Improved EventAddresses

Add methods to EventAddresses that wrap primitive types into objects that
are to be passed to String.format().
Channels are fully qualified not by passing a separate world byte but by
prepending the channel value with the world value in order to improve
performance.
Add SPECS_LOADED_NOTIFICATION to EventAddresses.
PARTY_BROADCAST, GUILD_BROADCAST, and CHATROOM_BROADCAST addresses now
only take on a world parameter.
Moved Boot class to net.pjtb.vs.shared package.