Build

Convert everything to C++ and add tests #132

Job	Run time
build (ubuntu-latest, Release, gcc, g++)	45s
build (ubuntu-latest, Release, gcc, clang++)	49s
build (ubuntu-latest, Release, clang, g++)	57s
build (ubuntu-latest, Release, clang, clang++)	52s
build (ubuntu-latest, Debug, gcc, g++)	25s
build (ubuntu-latest, Debug, gcc, clang++)	37s
build (ubuntu-latest, Debug, clang, g++)	30s
build (ubuntu-latest, Debug, clang, clang++)	34s
build (macos-latest, Release, gcc, g++)	55s
build (macos-latest, Release, gcc, clang++)	38s
build (macos-latest, Release, clang, g++)	48s
build (macos-latest, Release, clang, clang++)	37s
build (macos-latest, Debug, gcc, g++)	30s
build (macos-latest, Debug, gcc, clang++)	29s
build (macos-latest, Debug, clang, g++)	27s
build (macos-latest, Debug, clang, clang++)	32s
build (windows-latest, Release, gcc, g++)	1m 17s
build (windows-latest, Release, gcc, clang++)	1m 15s
build (windows-latest, Release, clang, g++)	1m 58s
build (windows-latest, Release, clang, clang++)	1m 49s
build (windows-latest, Debug, gcc, g++)	1m 15s
build (windows-latest, Debug, gcc, clang++)	47s
build (windows-latest, Debug, clang, g++)	1m 20s
build (windows-latest, Debug, clang, clang++)	48s
	20m 54s

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