[Quest API] Add Native Database Querying Interface (#4531)

* Add database quest API

API functions are named to be similar to LuaSQL and perl DBI

New connections are made for Database objects. These can either use
credentials from the server eqemu_config or manual connections.

* Add option to use zone db connections

zone/quest_db.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <memory>
+
+class Database;
+
+// Base class for quest apis to manage connection to a MySQL database
+class QuestDB
+{
+public:
+	enum class Connection { Default = 0, Content };
+
+	// Throws std::runtime_error on connection failure
+	QuestDB() : QuestDB(Connection::Default) {}
+	QuestDB(Connection type) : QuestDB(type, false) {}
+	QuestDB(Connection type, bool connect);
+	QuestDB(const char* host, const char* user, const char* pass, const char* db, uint32_t port);
+
+protected:
+	// allow optional ownership of pointer to support using zone db connections
+	struct Deleter
+	{
+		Deleter() : owner(true) {}
+		Deleter(bool owner_) : owner(owner_) {}
+		bool owner = true;
+		void operator()(Database* ptr) noexcept;
+	};
+
+	std::unique_ptr<Database, Deleter> m_db;
+};