[Titles] Cleanup titles, title suffix, and last name methods. (#2174)

* [Titles] Cleanup titles, title suffix, and last name methods.
- Use strings instead of const chars*.
- Add optional parameter to SetAATitle in Lua so you can save to the database similar to Perl.
- Cleanup #lastname command.
- Cleanup #title command.
- Cleanup #titlesuffix command.

* Update npc.cpp

zone/lua_npc.h

@@ -140,7 +140,7 @@ public:
 	void RecalculateSkills();
 	void ScaleNPC(uint8 npc_level);
 	bool IsRaidTarget();
-	void ChangeLastName(const char *lastname);
+	void ChangeLastName(std::string last_name);
 	void ClearLastName();
 	bool HasItem(uint32 item_id);
 	uint16 CountItem(uint32 item_id);