Core/Database: Converted the database library to a shared library.

* There is still the possibility to static link against database.

(cherry picked from commit 6cfea2d8f7de3de8206a1f4cf23a6d653814afe1)

src/server/database/Database/MySQLConnection.h

@@ -35,7 +35,7 @@ enum ConnectionFlags
     CONNECTION_BOTH = CONNECTION_ASYNC | CONNECTION_SYNCH
 };
 
-struct MySQLConnectionInfo
+struct TC_DATABASE_API MySQLConnectionInfo
 {
     explicit MySQLConnectionInfo(std::string const& infoString)
     {
@@ -62,7 +62,7 @@ struct MySQLConnectionInfo
 
 typedef std::map<uint32 /*index*/, std::pair<std::string /*query*/, ConnectionFlags /*sync/async*/> > PreparedStatementMap;
 
-class MySQLConnection
+class TC_DATABASE_API MySQLConnection
 {
     template <class T> friend class DatabaseWorkerPool;
     friend class PingOperation;