Attempt to make the include order consistent in tests

System library included last

Rebase and add some more checks.
Move the build directory removal to the finalize() method so it can
be called by arc unit after the tests are run.

I found it, the unit test is added in D2825.
This is not core ordering, but you may want to rebase D2823 on top of D2825 so this change gets tested.

Can you point me to the test, I can't find it ?

Change configuration before removing the NDEBUG flag

Can you rename deprecated_rpc.py to rpc_deprecated.py to follow the new naming convention ?

Don't update the C library

Rebase, and lint

Superseeded by D2786

I will search for the cause of the performance issue and re-enable it when it gets fixed

Add double quotes

Add a comment and set the directory relative to the CMAKE_CURRENT_BINARY_DIR

Remove most of the arguments, check the cmake and ninja are installed

There are tests missing for some edge cases: nbits < 0, =0, =64 and > 64

Hack the CMAKE_CURRENT_BINARY_DIR variable as suggested.

Add a missing newline at the end of .arcunit

Complete rework.
This new proposal uses Ninja to find the dependencies and run the tests.
It is build upon the arc build command to ensure reproductible behavior.

Move the default build directory to the configuration file.

Allow to set the buil dir at any level.
Change the default build dir to build-cmake.

Improve error messages

The Qt5Widgets_UIC_EXECUTABLE variable is set by the find_package(Qt5Widget) which is searching for files according to the CMAKE_FIND_ROOT_PATH.
The platform files override the CMAKE_FIND_ROOT_PATH variable, so that cross compilation and gitian builds should be fine.