ToneAlarm class refactoring to implement an interface for hardware specific methods and a single ToneAlarm class.

 - Jenkins compile drop arch until container is updated and maintained
 - clang-tidy disable for now, the new version isn't respecting the existing configuration

uorb_to_ros_msgs: delete all messages on the out dir first, so it can also consider message deletions on the input dir

Some threads do not exit and are still running when
trying to exit SITL running under Windows in Cygwin.

This problem was introduced with:
- posix shell #10173 because of strating a child process
for the startup script and mixing up the signal handling
(only Ctrl+C broken)
- lockstep #10648 because of simulator threads not
stopping gracefully anymore with timing race conditions
(no graceful exit possible anymore)

I leave the SIGINT handler on its default implementation for
Cygwin which kills the process and all its threads when pressing
Ctrl+C.

This hotfix at least allows the usage of Ctrl+C again instead
of forcing the user to use the task manager to shut down
px4.exe going crazy on CPU load instead of exiting
everytime.

instead of the derivative of the vertical position which is
not the same value when using the ekf2 estimation.

Using the position derivative resulted in delayed landing because
the value for some reason often bumped over the theshold before
slowly converging towards zero while the velocity was within expected
accuary in all these cases.

    - micro-CDR in PX4/Firmware (e0680ffe2280620b81d415328f109dc8decaa1b8): https://github.com/eProsima/micro-CDR/commit/7a76880f90dfe702f4fa1723e22d1dcb491d7b9e
    - micro-CDR current upstream: https://github.com/eProsima/micro-CDR/commit/62d95c870eafb0cccc7bf70bb8a0cbb86f125a0e
    - Changes: https://github.com/eProsima/micro-CDR/compare/7a76880f90dfe702f4fa1723e22d1dcb491d7b9e...62d95c870eafb0cccc7bf70bb8a0cbb86f125a0e

    62d95c8 2019-01-24 Luis Enrique Muñoz Martín - Refs #4438. Modified the configuration of machine endianness. (#31)

* mavlink_receiver: generate rc channel count
* mavlink_receiver: zero out ignored rc channels, add comments

Coverity scan has been offline since Monday, January 7, 2019.