[BREAKING CHANGE] Move to C++20 - Improve compile times #63

Job	Run time
msvc (Debug)	42s
msvc (Release)	35s
clang-cl (Debug)	1m 21s
dpcpp (dpcpp, x86, Debug)	56s
clang-cl (Release)	1m 23s
clang (clang, x86, Debug)	2m 47s
dpcpp (dpcpp, sycl, Debug)	1m 3s
clang (clang, x86, Release)	2m 50s
gcc (gcc, x86, Debug)	2m 50s
dpcpp (dpcpp, x86, Release)	58s
gcc (gcc, x86, Release)	2m 47s
macosx (clang, x86_osx, Debug)	16s
dpcpp (dpcpp, sycl, Release)	1m 3s
gcc (gcc, aarch64, -Wno-psabi, Debug)	2m 54s
nvcc	1m 4s
macosx (clang, x86_osx, Release)	18s
gcc (gcc, aarch64, -Wno-psabi, Release)	2m 51s
riscv (clang, rvv128, Debug)	2m 49s
gcc (gcc, aarch64.sve, -Wno-psabi, Debug)	2m 43s
wasm (clang, wasm, Debug)	3m 14s
riscv (clang, rvv128, Release)	2m 54s
gcc (gcc, aarch64.sve, -Wno-psabi, Release)	2m 49s
wasm (clang, wasm, Release)	3m 39s
gcc (gcc, aarch64.sve2, -Wno-psabi, Debug)	2m 45s
gcc (gcc, aarch64.sve2, -Wno-psabi, Release)	2m 52s
gcc (gcc, ppc64, -Wno-psabi, Debug)	2m 51s
gcc (gcc, ppc64, -Wno-psabi, Release)	2m 57s
	56m 11s

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