Minesweeper Issue Completion

Fixed all issues that were associated with the minesweeper program, added a menu with a help and new game button and added a game status bar on the game that let's you know to pause you have to press escape, which takes you to a pause menu where you can then again resume your current game, and the status bar also indicates whether you win or lose when you win or lose, and when you win or lose it tells you to press escape to start a new game. The help menu also has simple instructions on how to play minesweeper. Also combined GUIGrid and TextGrid into one file called Grid.java and deleted Interface since it was not needed and added javadocs to test the methods in Grid.java in GridTest.java.