Added command-line / file parsing.

* DejaVuSans.ttf:
  Added as resource.

* sfmlnet-window-2.dll, sfmlnet-graphics-2.dll:
  Added as reference.

* Game.cs:
  Modified to use GameSettings.Mode.
  Spaced things out a little better.

* GameSettings.cs:
  Now uses VideoMode for width and height instead of separate variables.

* Program.cs:
  Implemented command parsing.

* CommandParser.cs:
  Fixed misplacement of NameSeparator.
  Fixed possible exception when parsing a non-single command.