MNT: move scripts to scripts/ subdirectory #214

Job	Run time
Scripts Check	6s
clang-format formatting check	12s
Ub-22 gcc-11 + MinGW	13m 9s
clang-tidy checks	7m 14s
Ub-22 gcc-11 C++14, static	7m 24s
Ub-22 gcc-11 C++03, static	7m 32s
Ub-22 clang-14 C++14	6m 37s
Ub-22 gcc-11 + RT-5.1 beatnik	11m 19s
Ub-22 clang-14 C++03	6m 40s
MacOS clang-12	6m 27s
Win2019 MinGW	12m 35s
	1h 19m 15s

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