Build

Switch back to Mono #375

Job	Run time
build (ubuntu-24.04, gcc-14, g++-14, Release)	6s
build (windows-2025, cl.exe, cl.exe, Release)	2m 26s
build (macos-15, clang, clang++, Debug)	13s
build (ubuntu-24.04, clang-18, clang++-18, Release)	8s
build (macos-15, clang, clang++, Release)	14s
build (ubuntu-24.04, gcc-14, g++-14, Debug)	9s
build (windows-2025, cl.exe, cl.exe, Debug)	2m 27s
build (ubuntu-24.04, clang-18, clang++-18, Debug)	6s
	5m 49s

Provide feedback