* Report coverage for almost all jobs
* Some jobs fail and are omitted
* Add more tests to `gen_tile_test.cpp`
* Also lightly cleaned up formatting
* Clean up cmake/* files
* So they don't report an empty version
* Remove commented `check_*` lines from `CMakeLists.txt` file
* These were left over from the initial CMake support implementation
For linting `CMakeLists.txt` & `*.cmake` files (`cmakelint`) as well as various other formats such as `HTML`, `MarkDown` & `YAML` (`prettier`.)
### Also:
* Upgrade `actions/checkout` from `v3` to `v4`
* Output coverage summary to GitHub Job step summary
* Minor build docs cleanup for `CentOS` & `FreeBSD`
