Simple Gomoku - Milestone 2

@fgmart

Ruowei Zhang: added win, draw image; freeze screen after one side wins; improved start, stop buttons' functionality

Xiaoling Zheng: modified classes and make-game dispatch; add draw for goal-test

We both worked on merging classes and gui.

Pvp mode finished.

Simple Gomoku - Milestone1

@fgmart

Ruowei Zhang: create frame, button, canvas, blocks, mouse event

Xiaoling Zheng: finish classes, goal test, make-game; worked on main

We will merge our code next week.

Simple-Gomoku-Project-Proposal

@fgmart