- only a few configs done yet

so that params can be marked as used from scripts.

it got moved to drivers/telemetry/hott

With minimum throttle set to 0, it was not possible to control the attitude
anymore at 0 throttle, the vehicle would just stay level.

This reverts commit 370fddc1.

Because the topic_listener got smaller.

Use a templated callback method for the code parts that we actually need
templates, and avoid using a template for the rest of the code.

Saves around 20KB of flash.

Make sure vehicle_air_data & vehicle_magnetometer are logged if ekf2 replay
is disabled.

to altitude_acceptance

is inside the xy acceptance radius but not inside the z acceptance radius

it is greater than the one in the mission item

controller. The yaw acceptance is defined by the mission item. If the pos
control sets it to NAN, then the yaw at a waypoint is ignored.

 - add to AddressSanitizer and UndefinedBehaviorSanitizer to CMAKE_BUILD_TYPE options
 - handle environment variable helpers outside of CMake
 - add -O1 optimization
 - cleanup whitespace

 - relative to the PX4 source directory root

- nuttx in PX4/Firmware (f3cbd3c744e9224bd55597fbfae23c56ce296544): https://github.com/PX4-NuttX/nuttx/commit/98a89513060c42215e9cd14f52a7fd7dcc08dacc
    - nuttx current upstream: https://github.com/PX4-NuttX/nuttx/commit/e31e94f5bd3cf68b9ed0f010724ac9122730dd21
    - Changes: https://github.com/PX4-NuttX/nuttx/compare/98a89513060c42215e9cd14f52a7fd7dcc08dacc...e31e94f5bd3cf68b9ed0f010724ac9122730dd21

    e31e94f 2018-09-21 David Sidrane - [REJECTED] kinetis:usbdev use CONFIG_KINETIS_USBOTG_PRIO at default