Rearrange startup buttons, add tutorial button with stub event

Fix #173

src/game/boe.actions.hpp

@@ -30,6 +30,7 @@ void handle_new_pc();
 void new_party();
 void handle_death();
 void start_new_game(bool force = false);
+void start_tutorial();
 location get_cur_direction(location the_point);
 bool outd_move_party(location destination,bool forced);
 bool town_move_party(location destination,short forced);