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/IridiumsbdStatus.msg

@@ -0,0 +1,15 @@
+uint64 timestamp				# time since system start (microseconds)
+uint64 last_heartbeat				# timestamp of the last successful sbd session
+uint16 tx_buf_write_index			# current size of the tx buffer
+uint16 rx_buf_read_index			# the rx buffer is parsed up to that index
+uint16 rx_buf_end_index				# current size of the rx buffer
+uint16 failed_sbd_sessions			# number of failed sbd sessions
+uint16 successful_sbd_sessions      # number of successful sbd sessions
+uint16 num_tx_buf_reset             # number of times the tx buffer was reset
+uint8 signal_quality                # current signal quality, 0 is no signal, 5 the best
+uint8 state                         # current state of the driver, see the satcom_state of IridiumSBD.h for the definition
+bool ring_pending                   # indicates if a ring call is pending
+bool tx_buf_write_pending           # indicates if a tx buffer write is pending
+bool tx_session_pending             # indicates if a tx session is pending
+bool rx_read_pending                # indicates if a rx read is pending
+bool rx_session_pending             # indicates if a rx session is pending