* Fix for lpe accel bias saturation.

* Formatting.

Just to make sure we don't lose any messages.

filtering files for code check seperately to enable fast use of git pre-commit hook to check code style
ask user to install pre-commit hook when code style is checked

Battery: directly evaluate critical battery state if set, wait longer for USB detection to happen (#5460)

* Enable a workaround for #5438

* Disable Travis Slack integration

* Fix formatting

Add configurations for Zephyr SITL. Add init script for Zephyr SITL. Update hexa_x.main.mix with leg control.

This splits vmount into inputs and outputs modules with a small API in
between. It allows for greater flexibility, as any input method can be
combined with any output method. At the same time it is easy to add a new
input or output module.

MavLink spec implementation

implemented vehicle_roi topic

rename old gimbal to rc_gimbal

little changes

corrected RC Gimbal group

Starting ROI implementation in commander

implementation done, needs to be tested

uhm..

add todo

Change to float32 for x,y and z

remove mission topic again, not needed

change roi coordinates to lat, lon and alt

adjust to float64

starting mount implementation

correcting small mistakes, compiles now

add todos

further progress

implementing parameters

adjust default parameters

started implementation of mavlink

fix typo

change to lat, lon and alt

fix typo :D

change to double (to represent float64)

add global_position_

add mount topic

commander mount implementation done

cleanup

almost finished

little fix

codestyle fixes

leave pitch at 0 degrees

added pitch calculation

codestyle changes

Undo vehicle_mount, react to updated parameters, parsing of CMD_DO_MOUNT_* in mount.cpp

start implementing mode override

forgot a semikolon.

add debug

Finish implementation of mount override and manual control.

fix codestyle

correct cleanup

rename to vmount

works now

fix rebase error

fix polling

refactoring and custom airframe for gimbal

couple changes

remove warnx

almost done

finally

What is going on?

change back to actuator_controls_2

working

bump parameter version number and some clarification

fix submodules

- remove broken ccache setup

When running a simulation with, for example,
make posix jmavsim
px4 crashed almost 100% reproducable near start up.

This turned out to be a stack overflow. On gitter
it was suggested that the main reason for this could
be stack sizes, as currently used, assume a 32bit pointer
size and that doubling the stack size for everything
but NuttX would be the Right Thing.

This is the solution that I came up with (it makes
my core dumps disappear).