Cleanup

Added files for Vector, SimpleGameMode and renamed GameMode to
GameModeBase.
Game Changes

Made the game Use a SimpleGameMode and added a public static int, Tick
in order to have the ball's thread sleep time consistent with the game's
tick time
Changes to Vector Behavior and Walls

Added the Wall,Goal and Ceiling classes to represent the box that goes
around the game

Removed the Vector file. Apparently System.Windows has a Vector class
that is sufficient.

Added some TODOs with the changes needed to Vector class (code compiles,
but is not as functional as before)

Added *.suo to the gitignore file