Update build system / move to CPM

[codecov-commenter]

Codecov Report

Patch coverage: 52.94% and project coverage change: +0.09 :tada:

Comparison is base (3c2fcc2) 2.39% compared to head (6580453) 2.48%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7 +/- ## ======================================== + Coverage 2.39% 2.48% +0.09% ======================================== Files 15 16 +1 Lines 962 1087 +125 Branches 0 663 +663 ======================================== + Hits 23 27 +4 + Misses 939 706 -233 - Partials 0 354 +354 ``` | Flag | Coverage Δ | | |---|---|---| | Linux | `2.08% <11.76%> (?)` | | | Windows | `1.15% <52.94%> (-1.24%)` | :arrow_down: | | macOS | `0.91% <11.76%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/game\_components.cpp](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2dhbWVfY29tcG9uZW50cy5jcHA=) | `0.00% <0.00%> (ø)` | | | [src/game\_hacking\_lesson\_01.cpp](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2dhbWVfaGFja2luZ19sZXNzb25fMDEuY3Bw) | `0.00% <0.00%> (ø)` | | | [src/game\_hacking\_lesson\_02.cpp](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2dhbWVfaGFja2luZ19sZXNzb25fMDIuY3Bw) | `0.00% <0.00%> (ø)` | | | [src/main.cpp](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL21haW4uY3Bw) | `5.19% <87.50%> (+4.02%)` | :arrow_up: | | [test/constexpr\_tests.cpp](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdC9jb25zdGV4cHJfdGVzdHMuY3Bw) | `100.00% <100.00%> (ø)` | | | [test/tests.cpp](https://codecov.io/gh/cpp-best-practices/travels/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdC90ZXN0cy5jcHA=) | `100.00% <100.00%> (ø)` | | ... and [10 files with indirect coverage changes](https://codecov.io/gh/cpp-best-practices/travels/pull/7/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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