let python's parse command-line args as usual

To avoid need of CMP0063 which is not available on older CMake versions

Later to be expanded to a more general tool but for now it only supports CBDT, SVG and CBDT.

...on static builds.

But keep use of cmake idiomatic way of making inlines hidden

This covers all built libraries now and both static and shared builds.

This change makes sure that non-MSVC builds using CMake properly hide
non-exported functions.

Put in the utility program that was missed in installation by replacing
the one that was duplicated.

The list of source files to pass to g-ir-scanner is becoming too
long for Windows, as Windows imposes a 8192-character limit for command
lines, so we need to first transform that list into a listings file, and
then use the --filelist option for g-ir-scanner to build the
introspection files.

Not all the compilers that HarfBuzz is buildable on supports round() and
has the header stdbool.h, so we check for them and define HAVE_ROUND and
HAVE_STDBOOL_H repsectively in our CFLAGS so that we include them only
when they are found, or use fallback implementations when necessary.

Also include FindPythonInterp earlier as we need PYTHON_EXECUTABLE to be
set for running the tests.

Also, call c++filt on their results.

Also build and fix and check harfbuzz-gobject.def

Also changes harfbuzz-gobject to distribute generated enum sources.

Due to how ninja runs clang and gcc, it doesn't colorize the output
like make does. This forces color output in this situation.