Fix spacing issue.
Allow users to specify custom range of selectable board locations.
Allow the human player to select only valid locations in case of MOVE_PIECE.
Better usage of methods related to query flags.
Provide visual feedback about the selected piece in case of MOVE_PIECE actions.
Hide the last selected board location when selection type is set to NONE.
Add missing forward declaration.
Add support for AI players in the graphics game.
Test AI Players during playing state.
Allow selection only with left mouse button.