The standard DIM() macro was not typesafe as it happily deferred errors
to runtime that can be caught at compile time. Replacing it with a
generic C++11 constexpr allows for typecasting, comparison and compile
time error checking.
Devolve the logic as to whether a pad should be numbered or not
to a pad utility function. Add a very simplistic test for this
function (demonstrating how to test BOARD_ITEMs in general).
The intention here is to make it possible to wrap up many of the
KiCad utility tools into a single executable. This reduces link times
as well as the duplication of CMake files needed to build very
similar tools.
This particular tool should be suitable for any code in common,
code in pcbnew and other end-executables probalby will need an
analagous version linked to the relevant kiface.
The first tool is the coroutine_example.cpp test case, which
can be useful when learning, debugging or porting the coroutine
infrastructure.
