[Quest API] Add getcleannpcnamebyid(npc_id) to Perl/Lua. (#1383)

* [Quest API] Add optional clean name parameter to getnpcnamebyid in Perl/Lua.
- Allows Server Operators to grab the clean name without having to clean it up in their Perl/Lua.

* Convert from a parameter to a method.

* Add safer method.

* Convert to proper type.

common/database.h

@@ -140,6 +140,7 @@ public:
 	void	GetCharName(uint32 char_id, char* name);
 	std::string GetCharNameByID(uint32 char_id);
 	std::string GetNPCNameByID(uint32 npc_id);
+	std::string GetCleanNPCNameByID(uint32 npc_id);
 	void	LoginIP(uint32 AccountID, const char* LoginIP);
 
 	/* Instancing */