[Saylinks] Implement Auto Saylink Injection (#1525)

* Implement auto saylink injection

* Cover Lua say since it takes a different code path

common/say_link.h

@@ -1,17 +1,17 @@
 /*	EQEMu: Everquest Server Emulator
-	
+
 	Copyright (C) 2001-2016 EQEMu Development Team (http://eqemulator.net)
 
 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; version 2 of the License.
-	
+
 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY except by those people which sell it, which
 	are required to give you total support for your newly bought product;
 	without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 	A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-	
+
 	You should have received a copy of the GNU General Public License
 	along with this program; if not, write to the Free Software
 	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
@@ -105,6 +105,7 @@ namespace EQ
 
 		void Reset();
 
+		static std::string InjectSaylinksIfNotExist(const char *message);
 	private:
 		void generate_body();
 		void generate_text();