Releasing semaphore IDs on Linux seems to be solved, however it seems that named event is not correctly implemented on macOS also.

The following test throws exception with errno 28 (ENOSPC):

		int i = 0;
		for (; i < 40000; i++)
		{
			name = std::string("TestEvent ") + std::to_string(i);
			NamedEvent* ne = new NamedEvent(name);
			delete ne;
		}

sem_unlink shall probably be called somewhere, however I am not familiar with semaphores in details.

@aleks-f , @obiltschnig , please take a look at this PR. It seems to work properly, however I am not 100% percent familiar with NamedEvent.