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).

Comment corrections

Fix build error

Capitalization mistake for headers

Non-Mac compiler issue

Baudrate for crazyflie nrf and fix code style

Save space

Cleanup mpu9250 driver

Fixes for other boards

Functioning sensors

Working crazyflie firmware build

* Console on USART3
* Could not disable building PX4IO firmware, currently commented out

Don't build PX4IO firmware if the board doesn't ask for it

Added crazyflie motor driver

Fixed wrong register

CLK_SEL is in PWR_MGMT_1

Initial I2C/SPI MPU9250 device

* Tested with I2C
* Need to add error checking
* Intermittent crash on stop call

Working ak8963 mag driver

Functional lps25h driver. Work in progress.

Works well enough to probe and allow sensors task to start.

Added serial port test module

HACK! Get sensors module working

Set crazyflie PWM range

Extend baudrate for Crazyflie's NRF radio

Added dummy tone alarm to allow for init

Added autostart script for Crazyflie

After I got a compiler warning for a printf format in this file
(which I cannot reproduce anymore; for some reason g++ is usually
quite happy with all the errors in this file), I fixed all 'printf'
formats to match the type of their arguments as follows:

uint8_t         : %hhu
uint16_t        : %hu (or %hx)
uint32_t        : %u (or %x)
int16_t         : %hd
int and int32_t : %d
long int        : %ld

Since this file is C++, what we REALLY should be using is
ostream operator<<'s of course (type safe by design and faster
(compile time type matching, no need for format decoding)).

* Publishes LPE GPS epv and eph as estimator status.

* Adds timestamp

otherwise the battery estimator does not compute bat_v_empty_dynamic correctly

readdir_r is deprecated since glibc version 2.24 and glibc manual
recomends usage of readdir instead of readdir_r.
Replacing readdir_r by readdir will also not be a problem for Nuttx,
because readdir_r is using readdir and filling parameters with the
return information.

Signed-off-by: Otavio Pontes <otavio.pontes@intel.com>

* Use sorted to fix python3 build error

* Add drv_hrt.h include to Bebop df wrappers

This will make the build works in distros that have Python 3 as default
and will not break anything in distros that have Python 2 as default.