removes fragment, highlights current player square
refactors QuoridorActivity, adds functions to handle ui state after a move
changes start menu label in manifest
makes activity scrollable, prevents quoridor activity from recreating on orientation change
adds label to display game status
adds menu to quoridor activity, allowing user to restart, quit or return to start menu
fixes wall placing bug
removes unused code from quoridor activity
displays warning when placing invalid wall
begins implement jump over