Implement global loot system Fixes #619

This should allow us to emulate lives global tables

The options available to filter tables are min_level, max_level, race,
rare, raid, race, class, bodytype, and zone.

race, class, bodytype, and zone are a pipe | separated list of IDs

zone/mob.cpp

@@ -266,6 +266,7 @@ Mob::Mob(const char* in_name,
 	IsFullHP = (cur_hp == max_hp);
 	qglobal = 0;
 	spawned = false;
+	rare_spawn = false;
 
 	InitializeBuffSlots();