Add: Support for KHR_accessor_float64 #448

Job	Run time
build_windows_deprecated_extensions	3m 12s
build_windows (NO)	3m 30s
build_linux (gcc-9, NO)	2m 16s
build_linux_deprecated_extensions (gcc-9)	1m 57s
build_windows (YES)	4m 37s
build_linux (gcc-10, NO)	2m 1s
build_linux_deprecated_extensions (gcc-10)	1m 58s
build_linux (gcc-10, YES)	2m 10s
build_linux_deprecated_extensions (clang-13)	2m 39s
build_linux (clang-13, NO)	3m 38s
build_linux (clang-15, NO)	2m 35s
build_linux (clang-15, YES)	2m 16s
	32m 49s

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