- increase the minimum pwm value for multirotor mode since we experienced
the rear motor stalling in certain situations when throttle was low

Signed-off-by: Roman <bapstroman@gmail.com>

Addressing review comments in PR #9096

This prevents the expanction of the ERROR macro inside the TuneID enum

This is included in other stm32 architectures in the stm32.h file.

Change to be coherent with the change on NuttX upstream, in the future
STM32_BKP_BASE will be removed. This is using the definition over stm32_rtc.h interface.

The indexes are directly mapped from MAVLink, thus the actual value is
important.

Adds ability for generate_listener.py to process out-of-tree uORB message definitions as well (#9097)

No need for this since beat's changes in syslink_main.cpp work for connecting crazyflie to QGC. 
Will open a separate PR for it.

Discussed in https://github.com/PX4/Firmware/issues/8924

* Batt_smbus. Added complementary filter to remaining capacity, reversed warning state checks, and added remaining/discharged out of range checks to handle bad battery calibrations

* Changed errx to PX4_ERR

* Added PX4_ERR returns

- On initialization _v_att_sp got filled with zeros
  leaving invalid quaternions
- While not armed mc_pos_control did not publish any
  attitude setpoint which makes no sense
- The attitude control just uses the data in _v_att_sp
  if it was (ever) updated or not

While operating on exactly normalized float quaternions
it can aparently still happen that one of the elements
gets just slightly above 1 or below -1 and hence out of
the domain of the acosf and asinf functions resulting in
NaN. The constrain function uses stricly smaller/bigger
comparisons and catches all tested cases.

I found a better solution for the condition of the numerical
corner case and also tried to comment it more clearly.

- Delete left over identity matrix.

- Corner case with a zero element when using the signum function:
We always need a sign also for zero.

- Corner case with arbitrary yaw but and 180 degree roll or pitch:
Reduced attitude control calculation always rotates around roll
because there's no right choice when neglecting yaw. In that small
corner case it's better to just use full attitude contol and hence
rotate around the most efficient roll/pitch combination.