Updated "MacOS X" strings to "macOS"

build_configs/darwin_macports.txt

cmake_support/FindPython.cmake

deployment/macos/pack.py

modules/doc/install.rst

modules/doc/intro.rst

modules/doc/newmodule.rst

modules/gfx/src/glext_include.hh

modules/gui/doc/tools.rst

modules/gui/pymod/__init__.py

modules/gui/src/tools/tool.hh