Accounted For Relativity

I added some changes that more accurately take Relativity into
consideration. This means that Ship objects won't be able to accelerate
to the speed of light. Keep in mind that I didn't use Relativity for
gravitational force because I wasn't sure of whether Relativity effects
the gravitational force.
Added Relativity Changes To Server And Client

I added the previous change to the Server and Client. I also added a
similar change to the Missile class.
Relativity Changes For Momentum

The relation between relativity and momentum will now be consistent. I
did this by reformatting the gravitate() method in the Entity class. I
also added the change to the Server and Client.
Ship Names

I added a bunch of well-needed Ship Names. Also, I added to the Server
and Client.
Added Player Class

The Player class will be used for keeping track of whether or not
players are active or not. This will allow for players to disconnect and
reconnect to the server.
Added GUI To Server Plus Some Menus

I added an Applet drawer, and some menu code as well.