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)

ROMFS/px4fmu_common/init.d-posix/CMakeLists.txt

@@ -36,7 +36,6 @@ add_subdirectory(airframes)
 px4_add_romfs_files(
 	px4-rc.mavlink
 	px4-rc.params
-	px4-rc.rtps
 	px4-rc.simulator
 	rc.replay
 	rcS

ROMFS/px4fmu_common/init.d-posix/px4-rc.rtps

@@ -1,4 +0,0 @@
-#!/bin/sh
-# shellcheck disable=SC2154
-
-micrortps_client start -t UDP -r $((2019+2*px4_instance)) -s $((2020+2*px4_instance))

ROMFS/px4fmu_common/init.d-posix/rcS

@@ -259,11 +259,8 @@ fi
 
 navigator start
 
-# Try to start the micrortps_client with UDP transport if module exists
-if px4-micrortps_client status > /dev/null 2>&1
-then
-	. px4-rc.rtps
-fi
+# Try to start the microdds_client with UDP transport if module exists
+microdds_client start -t udp -p 8888
 
 if param greater -s MNT_MODE_IN -1
 then