-closes #5862

The "targets" posix_rpi_common, qurt_sdflight_default and
posix_sdflight_default are not real targets; they are
just files in cmake/configs that are included by other
targets.

 -fixes #5625

* Allow Niga to be disabled from command line

* Add a build all nuttx targets

* Makefile simplify check and quick_check

* make check add crazyflie_default

-fixes #5484

On second thought, using % just isn't correct. When a make
target looks like:

foo% bar%:
	...

Then that implies that it will build BOTH foo% and bar% whenever
that rule is triggered (by either) for any value of the pattern %.

Clearly that is not what we want / intend.

So, this commit goes back to using config targets without a % in it
by generating a full list of them.

It also turns sitl_deprecation into a Hidden Target.

Finally, now that we have those target lists anyway, I added
a 'help' and 'list_config_targets' targets that print the
available targets.

Note that the '%' catch-all target only works when all other targets
either have a recipe or are marked as .PHONY, otherwise such targets
are only interpretted as dependencies and still executre the '%'
target afterwards, which is not what we want.

* This allows one to run 'make posix list_vmd_make_targets' and get output like

>make posix list_vmd_make_targets
[...]
-- Build files have been written to:
/usr/src/debian/px4/Firmware/Firmware.git/build_posix_sitl_default
PX4 CONFIG: /usr/src/debian/px4/Firmware/Firmware.git/build_posix_sitl_default
Scanning dependencies of target list_vmd_make_targets
[100%] List of acceptable 'posix_sitl_default' <viewer_model_debugger> targets:
none
none_iris
none_iris_opt_flow
none_tailsitter
[...]
replay_solo_valgrind
replay_typhoon_h480_valgrind
[100%] Built target list_vmd_make_targets

Or, run 'make list_vmd_make_targets' from the build_posix_* directory.

* This adds the list_cmake_targets make target to print all
cmake targets that one can match with PX4_NO_OPTIMIZATION.
PX4_NO_OPTIMIZATION is ignored (do optimization as normal)
when the CONFIG isn't posix_sitl_*.

* Add comment in Makefile on how/where to find all targets.

Use $(MAKE) -C build_dir ..., not (cd build_dir; make ...)
(ie, see https://blog.flameeyes.eu/2010/10/tell-tale-signs-that-your-makefile-is-broken)

Also talk about 'make targets' where appropriate, instead of 'cmake targets' %-).

Doesn't really do anything, but while working on understanding
things I did this cleanup, making the Makefile a lot shorter
and more flexible for future changes ;).

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

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

* Path cleanup for SITL.

* Restructured sitl scripts dir.

* Set integration tests to use ekf2 for vtol.

* Fix sitl paths for mac.

This reverts commit 699b6a2c.

* make tests use px4 instead of mainapp

* commander_tests ALTCTL - not rotary requires altitude

sitl CI is having some issue cloning, but I have verified it locally for various configs

The reason for this change is that RPi2 and RPi3 are compatible, and
hopefully all differences coming up can be resolved without ifdefs but
at runtime.

We currently only support Navio2, so let's fuse the two configurations.

For replay with the new logger, we want a separate build dir so that the
parameters file and orb rules don't get mixed up.