Item Detailed Notifications Improvements

[youbetterdont]

• "Item detailed notifications" works as before when "Item Close Notifications" is enabled.
• When "Item Close Notifications" is disabled, the detailed notifications are no longer generated when you leave an area and return to the item or when you drop an item. This uses ITEMFLAG_NEW described here. Also see the 4th hex digit in the test below, i.e., a02010.
• The loop that iterated each item in a room to check against each map rule has been replaced with a lookup from the map action cache.
• %notify-dead% is now supported with detailed notifications.

[youbetterdont]

These changes are included in #50