[BREAKING CHANGE] Move to C++20 - Improve compile times #67

Job	Run time
wasm (clang, wasm, Debug)	3m 8s
macosx (clang, x86_osx, Debug)	20s
wasm (clang, wasm, Release)	3m 30s
macosx (clang, x86_osx, Release)	19s
clang (clang, x86, Debug)	2m 52s
clang-cl (Debug)	1m 56s
clang (clang, x86, Release)	2m 47s
clang-cl (Release)	1m 29s
dpcpp (dpcpp, x86, Debug)	58s
gcc (gcc, x86, Debug)	2m 50s
dpcpp (dpcpp, sycl, Debug)	1m 26s
msvc (Debug)	46s
gcc (gcc, x86, Release)	2m 48s
dpcpp (dpcpp, x86, Release)	1m 23s
riscv (clang, rvv128, Debug)	3m 58s
msvc (Release)	1m 11s
gcc (gcc, aarch64, -Wno-psabi, Debug)	2m 53s
riscv (clang, rvv128, Release)	2m 59s
dpcpp (dpcpp, sycl, Release)	1m 5s
gcc (gcc, aarch64, -Wno-psabi, Release)	2m 49s
gcc (gcc, aarch64.sve, -Wno-psabi, Debug)	3m 20s
gcc (gcc, aarch64.sve, -Wno-psabi, Release)	2m 48s
gcc (gcc, aarch64.sve2, -Wno-psabi, Debug)	2m 46s
gcc (gcc, aarch64.sve2, -Wno-psabi, Release)	2m 51s
gcc (gcc, ppc64, -Wno-psabi, Debug)	2m 49s
gcc (gcc, ppc64, -Wno-psabi, Release)	2m 44s
	58m 45s

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