uorb: allow for more than 255 uORB messages

Increased size for ORB_ID from uint8_t to uint16_t

Created a type: orb_id_size_t = uint16_t.
There are still a couple of places where the size
of the ORB_ID is assumed to be less than 16-bits.
The places that I have found are commented regarding
this and can be found with a search on orb_id_size_t.

src/modules/logger/logged_topics.h

@@ -88,7 +88,7 @@ public:
 		RequestedSubscription sub[MAX_TOPICS_NUM];
 		int count{0};
 
-		uint8_t excluded_optional_topic_ids[MAX_EXCLUDED_OPTIONAL_TOPICS_NUM];
+		orb_id_size_t excluded_optional_topic_ids[MAX_EXCLUDED_OPTIONAL_TOPICS_NUM];
 		int num_excluded_optional_topic_ids{0};
 	};
 

src/modules/logger/logger.h

@@ -365,7 +365,7 @@ private:
 	uint16_t 					_event_sequence_offset{0}; ///< event sequence offset to account for skipped (not logged) messages
 	uint16_t 					_event_sequence_offset_mission{0};
 
-	uint8_t						_excluded_optional_topic_ids[LoggedTopics::MAX_EXCLUDED_OPTIONAL_TOPICS_NUM];
+	orb_id_size_t  					_excluded_optional_topic_ids[LoggedTopics::MAX_EXCLUDED_OPTIONAL_TOPICS_NUM];
 	int						_num_excluded_optional_topic_ids{0};
 
 	LogWriter					_writer;