Added some initial support for persisting players when they leave the game and restoring them on return.
Added fix for handling of null audio manager (sounds load through the current manager).
Further developed TerasologyTestEnvironment (for unit testing in an ingame-like setup)
Some refactoring of packages
Some improvements to TerasologyTestingEnvironment
Moved EntitySystem benchmarks into benchmark code.
Refactored and added some javadoc to the network classes and interfaces