Move RC and DL failsafe actions handling from navigator to commander (credits to @AndreasAntener)
Separate manual kill switch handling via manual_lockdown to prevent override and release of software lockdown by RC switch

Other changes:
Add failsafe tune
Fix LED blinking for Pixracer
Return back support for rc inputs in simulator but now it is configurable via cmake

-closes #5862

https://www.gnu.org/software/global/

The toolchain_* files are target OS specific so they were moved to
the target OS subdir.

The gcc_version.* files are only cleared once per make instantiation so
a build that creates multiple HW targets will try to link with an
incompatible .o file (i.e. x86 build linking ARM .o).  I created
posix-arm as a separate target to fix this problem.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

The generated file is not created in the Build tree and is
automatically ignored

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

The posix build would complain that toipc_listener.cpp did not exist
and there was no rule to create it.

The required rule was added to src/systemcmds/topic_listener/module.mk

The script generate_listener.py is run from the Build tree and needs to
access $(PX4_BASE)/msgs so $(PX4_BASE) is now passed as an argument to
generate_listener.py

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

Automated updates of the C++ code generated by the multi_tables script, now it is placed into the mixer_multirotor.generated.h file which is generated by makefile

Standard and embedded types work, may need small refinements for some
types

Initial UAVCAN integration. The library compiles successfully, CAN driver appears to be working properly. There is one hardcoded path in the module makefile that needs to be fixed; plus the compilation will likely fail unless arch/math.h contains log2l()