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/Airspeed.msg

@@ -0,0 +1,10 @@
+uint64 timestamp                 # time since system start (microseconds)
+uint64 timestamp_sample
+
+float32 indicated_airspeed_m_s   # indicated airspeed in m/s
+
+float32 true_airspeed_m_s        # true filtered airspeed in m/s
+
+float32 air_temperature_celsius  # air temperature in degrees Celsius, -1000 if unknown
+
+float32 confidence               # confidence value from 0 to 1 for this sensor