Created sound class and made case statements for each of the current
sounds in the assests folder using the "/ichigoCombat/nameof attack"
structure currently being used. Added menu screen music to loop while on
menu screen and stop when menu screen is left. As menu is currently
controlled by mouse and has not been updated, made "Ping" sound play
when option is selected on menu screen, as well as back button on
options menu. Once controls are updated to keyboard, adding sound option
will take simply calling the name playSound method.