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/FollowTargetStatus.msg

@@ -0,0 +1,12 @@
+uint64 timestamp                  # [microseconds] time since system start
+
+float32 tracked_target_course     # [rad] Tracked target course in NED local frame (North is course zero)
+float32 follow_angle              # [rad] Current follow angle setting
+
+float32 orbit_angle_setpoint      # [rad] Current orbit angle setpoint from the smooth trajectory generator
+float32 angular_rate_setpoint     # [rad/s] Angular rate commanded from Jerk-limited Orbit Angle trajectory for Orbit Angle
+
+float32[3] desired_position_raw   # [m] Raw 'idealistic' desired drone position if a drone could teleport from place to places
+
+bool in_emergency_ascent          # [bool] True when doing emergency ascent (when distance to ground is below safety altitude)
+float32 gimbal_pitch              # [rad] Gimbal pitch commanded to track target in the center of the frame