-Correction of the KeyListener : we can now control the array by
clicking on the tiles themselves
-Addition of the 2 holloowed tiles of the connect 4 : they have been
stored in the icon package and are used when hovering over a column or a
column button.
-The GUI class now implements the MouseListener interface means that
everytime something is hovered over in the gui it will go on the Entered
method of the mouse listener.
-The upper panel buttons now implements this hover function and are
correctly displaying a hollow pawn where it should go
-The button array in the middle panel now implement everything and is
working with both hovering and clicking
-Fixed column selector now reset every game that are launcher