uORB: add bitset for faster orb_exists check and remove uORB::Subscription lazy subscribe hack/optimization

- add PX4 bitset and atomic_bitset with testing
 - add uORB::Subscription constructor to take ORB_ID enum
 - move orb test messages into msg/

src/modules/logger/logger.cpp

@@ -46,7 +46,7 @@
 #include <time.h>
 
 #include <uORB/PublicationQueued.hpp>
-#include <uORB/uORBTopics.h>
+#include <uORB/topics/uORBTopics.hpp>
 #include <uORB/topics/parameter_update.h>
 #include <uORB/topics/vehicle_command_ack.h>
 #include <uORB/topics/battery_status.h>
@@ -508,7 +508,7 @@ bool Logger::initialize_topics(MissionLogType mission_log_mode)
 			const LoggedTopics::RequestedSubscription &sub = logged_topics.subscriptions().sub[i];
 			// if we poll on a topic, we don't use the interval and let the polled topic define the maximum interval
 			uint16_t interval_ms = _polling_topic_meta ? 0 : sub.interval_ms;
-			_subscriptions[i] = LoggerSubscription(sub.topic, interval_ms, sub.instance);
+			_subscriptions[i] = LoggerSubscription(sub.id, interval_ms, sub.instance);
 		}
 	}