added phase 1 of 3D board
fixed interpolation
deleted wrong mock output class
added game instantiation dependency on io object
changed 3D boards in tests to visual depictions
changed all tests to expect syntax
fixed command line/display board for 3D board
extracted make move function and made those functions private
moved menu prompt messages as private functions
changed function name to split_board_into_rows
finished 3D ttt (added cube crossing diagonals)