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/global_loot_manager.h

@@ -0,0 +1,61 @@
+#ifndef GLOBAL_LOOT_MANAGER_H
+#define GLOBAL_LOOT_MANAGER_H
+
+#include <vector>
+#include <string>
+
+class NPC;
+class Client;
+
+namespace GlobalLoot {
+
+enum class RuleTypes {
+	LevelMin = 0,
+	LevelMax = 1,
+	Race = 2,
+	Class = 3,
+	BodyType = 4,
+	Rare = 5,
+	Raid = 6,
+	Max
+};
+
+struct Rule {
+	RuleTypes type;
+	int value;
+	Rule(RuleTypes t, int v) : type(t), value(v) { }
+};
+
+};
+
+class GlobalLootEntry {
+	int m_id;
+	int m_loottable_id;
+	std::string m_description;
+	std::vector<GlobalLoot::Rule> m_rules;
+public:
+	GlobalLootEntry(int id, int loottable, std::string des)
+		: m_id(id), m_loottable_id(loottable), m_description(std::move(des))
+	{ }
+	bool PassesRules(NPC *mob) const;
+	inline int GetLootTableID() const { return m_loottable_id; }
+	inline int GetID() const { return m_id; }
+	inline const std::string &GetDescription() const { return m_description; }
+	inline void SetLootTableID(int in) { m_loottable_id = in; }
+	inline void SetID(int in) { m_id = in; }
+	inline void SetDescription(const std::string &in) { m_description = in; }
+	inline void AddRule(GlobalLoot::RuleTypes rule, int value) { m_rules.emplace_back(rule, value); }
+};
+
+class GlobalLootManager {
+	std::vector<GlobalLootEntry> m_entries;
+
+public:
+	std::vector<int> GetGlobalLootTables(NPC *mob) const;
+	inline void Clear() { m_entries.clear(); }
+	inline void AddEntry(GlobalLootEntry &in) { m_entries.push_back(in); }
+	void ShowZoneGlobalLoot(Client *to) const;
+	void ShowNPCGlobalLoot(Client *to, NPC *who) const;
+};
+
+#endif /* !GLOBAL_LOOT_MANAGER_H */