Reformatting makes it look worse than it is, but it really only adds {}

This saves ~1.1KB of RAM for systems with only 1 sensor of each type.

If there are more sensors, they will be dynamically added, such that
failover still works.

reduces the stack depth

* param: fix bug when param value is changed to 'zero' for the first time, it won't be saved.

* param: revert incorrectly removed code.

This fixes the case where more than 10 args were needed for instance
when starting mavlink with all its options.

Add GitHub links to maintenance team list.

Listing existing maintainers explicitly.

Current implementation checks against geofence only if it is in polygon form.
When it's created via params, it accepts all the waypoints as the number of vertices = 0.
Thus, changed the function to the one that is used to check whether geofence is breached in flight.

   Update the comment, to explain how to achive a different perescale
   value.

   Added PX4_IO_TIMER_ALTERNATE_RATE one board agnostic ifdef
   PX4_IO_TIMER_ALTERNATE_RATE that is non board specific.

   N.B.  I would like to eliminate PX4_IO_TIMER_ALTERNATE_RATE
   as well, but I need crazyflie HW to validate that the startup
   script can just set the rate on the PWM to 3921 fast enough to
   not effect the motors.

 Add PX4_PWM_ALTERNATE_RANGES in suport of a board agnostic way
 to override the PWM_.*_{MIN|MAX} values

 Removed #ifdef in version.h

   1) Remove uneeded spi and reset code
   2) Use the Board commin for providing the BOARD_NAME
   3) Add PX4_PWM_ALTERNATE_RANGES in suport of a board agnostic
      way to override the PWM_.*_{MIN|MAX} values
   4) Remove #ifdefs from the IO timers*. Drive the config deltas
      from the crazyflie_timer_config.c and one board agnostic
      ifdef PX4_IO_TIMER_ALTERNATE_RATE that is non board specific

      *I would like to eliminate PX4_IO_TIMER_ALTERNATE_RATE
      as well, but I need HW to validate that the startup
      script can just set the rate on the PWM to 3921 fast
      enough to not effect the motors.

  CONFIG_STM32_I2CTIMEOTICKS is hard defined on PX4 master
 and defconfig defined on upstream Nuttx (nuttx_v3) it will be fixed
 there.

 Aligned Make.Defs to use the build system's defined warnigns.

- fixes #5061

in C++11, double braces are needed for std::array aggregate initialization,
or assignment with =.
see: http://en.cppreference.com/w/cpp/container/array

See discussion in https://github.com/PX4/Firmware/issues/5756

'mavlink stop-all' during a log streaming session previously led to a
resource leak, and log streaming could only be re-started by rebooting the
system.

This is helpful, so that a connected partner can switch from broadcasting
to a 'connected' state.

(https://github.com/PX4/Firmware/pull/5704#pullrequestreview-6977559)

use all actuator groups for mixing.

use actuator_controls_3 for the time being

Signed-off-by: CarlOlsson <carlolsson.co@gmail.com>

orb_subscribe can succeed, but if there is no publisher, orb_copy will fail.
We still need to unsubscribe in that case.