Encapsulate variables and use getters & setters

[joyoyoyoyoyo]

No encapsulation is being used in this project.
Almost every variable is public. Getters and setters could be used instead.

This does not enforce separation of concerns.
Example code:

        game.b.draw(g);
        game.p1.draw(g);
        game.p2.draw(g);

[joyoyoyoyoyo]

200 pts

[omeedrj]

Approved: 200 pts

[zhanchengqian]

F16 OK

[brianslee]

W18 Ok 200 pts

[iamSamuelFu]

This fix actually requires more dedicate care as there are 25 classes total with even more variables. I suggest to make this a 300 pts issue.

[brianslee]

If you decide to fix this issue, I'll keep that in mind during feedback.

[brianslee]

Implemented in w18 branch. Feel free to look over their code.