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/DatabaseWorkerPool.cpp

@@ -317,6 +317,6 @@ T* DatabaseWorkerPool<T>::GetFreeConnection()
     return connection;
 }
 
-template class DatabaseWorkerPool<LoginDatabaseConnection>;
-template class DatabaseWorkerPool<WorldDatabaseConnection>;
-template class DatabaseWorkerPool<CharacterDatabaseConnection>;
+template class TC_DATABASE_API DatabaseWorkerPool<LoginDatabaseConnection>;
+template class TC_DATABASE_API DatabaseWorkerPool<WorldDatabaseConnection>;
+template class TC_DATABASE_API DatabaseWorkerPool<CharacterDatabaseConnection>;