During team relay races it's unsafe to retrieve crashed quads because the course is continuously hot. In order to safely fly a backup quad with the primary quad crashed in the field (but powered up) it's necessary to:
* Disable arming, so that the crashed quad doesn't unintentionally arm as well. This is specifically a problem when a transmitter can send signals to all powered up receivers (like FrSky and others).
* Change VTX to an unused channel with low power output
* Turn off telemetry
This change introduces a new mode called paralyze which disables arming and prevents mode changes (except beeper). It can only be invoked while the quad isn't armed. Once it's invoked, the FC has to be power cycled. In order to invoke it, the mode needs to be in a disengaged state at least once, so that forgetting to flip the switch back after crashing doesn't immediately invoke graveyard on the backup quad.
_Legal disclaimer: I am making my contributions/submissions to this project solely in my personal capacity and am not conveying any rights to any intellectual property of any third parties._
* add travis directorie cache for arm sdk
* Travis. Test if make all in one job would work. And how slow/fast.
* Travis. Check that the old method with a couple specific targets still works.
* Rebased master and build all targets again.
* Make verbosity level 0 even less verbose, was still too much for travis in one mega-jumbo-all-target build.
* Even less output from make in verbosity level 0. Some Makefile symbol name cleanup too.
* arm_sdk_install did not check if allready downloaded and installed. Added checks and deps. Travis caching might work better now...
* Build all 56 targets to test Travis caching perf.
* Build all 56 targets to test Travis caching perf. Again. Now with correct yml arrsy syntax.
* Added installation of ccache and also to Travis cache. Caching the cache.
* Travis. Remove some unused APT libs, to see if this affects caching and build times.
* Travis. YAPT (Yet another perf trial). Remove all apt package install.
* Disaster. Put back installation if build-essential.
* Disaster still. Put back installation if zliblg-dev.
* Disaster, again. Put back installation of libc6 .
* Travis. Minimizing APT installation as it not be cached, issue 5876 on travis-ci github.
* Travis. Added comment on target specification.
