* Fix typo in #include
* Remove CMakeLists file that users should create
* Clarify which files users are expected to create
* Highlight the importance of configuring TutorialConfig.h.in after
the MY_MATH option has been set
* Update minimum required version to 3.10
* Use VERSION argument to project command rather than separate variables
* Replace `endif(USE_MYMATH)` with more modern `endif()`
* Simplify the call to 'configure_file()'
* Add comments to tutorial.cxx to use as anchors in documentation
* Remove CMakeLists and TutorialConfig.h.in files that users should
create. Consequently, remove Step1 from CMake tests.
Revert the changes from commit f31343d69e (Tests: require C++14 for the
Tutorial, 2019-03-21, v3.15.0-rc1~41^2~2) for the content in its new
home. In commit 13ee44d267 (Clang: For MSVC ABI do not use modes older
than C++14, 2019-07-23) we fixed the C++ standard selection for GNU-like
Clang with the MSVC ABI so the test code itself no longer needs to do
it. In particular, changing the tests in this way broke the tutorial's
narrative.
Migrate tutorial text from individual `directions.txt` files to the main
tutorial document. Add some comments to source code to provide anchors
for inclusion.
w00657280