This tries to make the visibility.h header clearer and better
structured. We don't actually need the ifdef for lockstep enabled or
disabled because that's now handled elsewhere.

This define was not set anyway, and in my opinion we should
not use different code for tests anyway.

This makes sure we add the lockstep_scheduler_test even if the
ENABLE_LOCKSTEP_SCHEDULER is not set to yes. This means the
lockstep_scheduler is not used for SITL but the CMakeLists.txt file
still used and the test added.

* Added Aion R1 airframe
* Tuned PID values for Aion R1
* Changed to generic mixer and cleaned up configuration

Co-Authored-By: Matthias Grob <maetugr@gmail.com>

Add jerk parameter for auto mode MPC_JERK_AUTO. Specify when a parameter is only used in a certain manual or auto mode

timeout is an int, so it wraps when the poll timeout is >2147ms.
This happened in logger, resulting in poll never returning.

For now we need to ignore this warning which GCC 9 shows for the MAVLink
headers.

GCC 9 complained about stringop-truncation which is a cautionary message
to prevent using strncpy with non-null terminated strings.

We can fix this by copying one byte less than the destination size and
then manually adding the null termination, as we already do.

Since I reorder the points every time I open a pull request I thought I might as well propose this order for the template.

When simulating with lockstep we can raise the speed by setting the env
variable `PX4_SIM_SPEED_FACTOR`. Some inputs like RC, MAVLink heartbeats
from a ground station, or offboard controls via MAVLink are still at the
normal speed which leads to timeouts getting detected in PX4.

To work around this issue we can automatically multiply the timeout
parameters by the speed factor.

- fixes #12012

This fixes the IDs of multi UAVs started with ROS/Gazebo.

Previously the 3 vehicles were displayed in QGC as Vehicle 2, 3, 4.
With this change it is more intuitive Vehicle 1, 2, 3 and this is
also consistent with the way it is documented and how it is in
jMAVSim.

We forgot to add the option -s for jmavsim_run.sh which starts jMAVSim
with the UDP port connecting to the SDK (port 14540).

This fixes cross-talk between the QGC and SDK UDP ports for HITL.

This brings support for UDP port 14550 and 14540 for HITL simulation.

Example: Before when you passed "make tests TESTFILTER=Attitude"
and subsequently "make tests TESTFILTER=Atti" it found the string
"TESTFILTER=Atti" in "TESTFILTER=Attitude" and hence the check if
the configuration is already correct passed. The fix checks for
the configuration parameter including the subsequent space separator
and after that strips the space away again such that the list
VERIFIED_CMAKE_OPTIONS doesn't contain trailing spaces.

visibility.h is included globally in PX4 via cmake compile flags.
It contains poisoning the exit() command which is used by gtest
to close the test application. Removing the flag for gtest compilation
fixes the compile error:
gtest.cc:4757:7: error: attempt to use poisoned "exit"

* VTOL trans: changed that now in transition for both MC and FW the corresponding (correct) attitude controller is running
* attitude setpoint for stabilized mode is generated by tailsitter.cpp
* reset yaw setpoint during transition to avoid big yaw errors after
transition back to hover
* VT_TYPE parameter: added "reboot required" metadata