Method add_dependency

src/Threads/ThreadManager.h:222–225

* Adds a dependecy on 'dependency_key' from 'key' such that all the threads started with key * 'key' only start after all threads from 'dependency_key' are finished */

	 * 'key' only start after all threads from 'dependency_key' are finished
	 */
	static void add_dependency(const std::string& key, const std::string& dependency_key)
	{
		m_dependencies[key].insert(dependency_key);
	}

private:
	template <class _Fn, class... _Args>