Significant change to storm/darkness navigation

[Morgenes]

Rangers are no longer the masters of storm and darkness navigation.  This code has been reworked to include a new skill, direction sense.  This skill has been given to several subguilds in addition to the ranger guild.  It takes into account multiple things, including a particular type of worn object that until this change only gave role-played benefits for storm navigation.

[Morgenes]

Please discuss this change here: http://www.zalanthas.org/gdb/index.php/topic,38256.0.html