msg ROS2 compatibility, microdds_client improvements (timesync, reduced code size, added topics, etc), fastrtps purge

- update all msgs to be directly compatible with ROS2
 - microdds_client improvements
   - timesync
   - reduced code size
   - add to most default builds if we can afford it
   - lots of other little changes
 - purge fastrtps (I tried to save this multiple times, but kept hitting roadblocks)

msg/MissionResult.msg

@@ -0,0 +1,21 @@
+uint64 timestamp				# time since system start (microseconds)
+uint8 MISSION_EXECUTION_MODE_NORMAL = 0	# Execute the mission according to the planned items
+uint8 MISSION_EXECUTION_MODE_REVERSE = 1	# Execute the mission in reverse order, ignoring commands and converting all waypoints to normal ones
+uint8 MISSION_EXECUTION_MODE_FAST_FORWARD = 2	# Execute the mission as fast as possible, for example converting loiter waypoints to normal ones
+
+uint32 instance_count		# Instance count of this mission. Increments monotonically whenever the mission is modified
+
+int32 seq_reached		# Sequence of the mission item which has been reached, default -1
+uint16 seq_current		# Sequence of the current mission item
+uint16 seq_total		# Total number of mission items
+
+bool valid			# true if mission is valid
+bool warning			# true if mission is valid, but has potentially problematic items leading to safety warnings
+bool finished			# true if mission has been completed
+bool failure			# true if the mission cannot continue or be completed for some reason
+
+bool item_do_jump_changed	# true if the number of do jumps remaining has changed
+uint16 item_changed_index	# indicate which item has changed
+uint16 item_do_jump_remaining	# set to the number of do jumps remaining for that item
+
+uint8 execution_mode	# indicates the mode in which the mission is executed