Updated the readme a bit, soon to come: better description of the planed game design!
Renamed "Entity" to "WorldObject", because it seems more fitting.
Renamed "Ship" to "Vessel" and improved the description.
Refactored several classes such that location is now a float not an int, this is in order to improve the accuracy of movement and moreover the consistency across different directions, which was previously low enough for travel at certain angles to be what seemed to be at least 3 times faster or slower than others.

there is still a fair amount of reorganization of classes and movement of code between classes to continue improving the conceptual structure, however as it now seems that java will only be used for design-concept testing, and the project will probably be completely rebuilt in c++, this may not occur in the end.