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/PositionControllerLandingStatus.msg

@@ -0,0 +1,16 @@
+uint64 timestamp # [us] time since system start
+float32 lateral_touchdown_offset # [m] lateral touchdown position offset manually commanded during landing
+bool flaring # true if the aircraft is flaring
+
+# abort status is:
+# 0 if not aborted
+# >0 if aborted, with the singular abort criterion which triggered the landing abort enumerated by the following abort reasons
+uint8 abort_status
+
+# abort reasons
+# after the manual operator abort, corresponds to individual bits of param FW_LND_ABORT
+uint8 NOT_ABORTED = 0
+uint8 ABORTED_BY_OPERATOR = 1
+uint8 TERRAIN_NOT_FOUND = 2 # FW_LND_ABORT (1 << 0)
+uint8 TERRAIN_TIMEOUT = 3 # FW_LND_ABORT (1 << 1)
+uint8 UNKNOWN_ABORT_CRITERION = 4