Rework Vector_softRemove() and compact() operations #5375

Job	Run time
build-ubuntu-latest-full-featured-clang	2m 44s
build-ubuntu-latest-full-featured-gcc	1m 17s
build-ubuntu-latest-minimal-gcc	44s
build-ubuntu-latest-minimal-clang	2m 49s
build-unsupported-latest-gcc	39s
build-ubuntu-latest-pcp	47s
build-ubuntu-latest-clang-sanitizer	3m 14s
build-macos-latest-clang	47s
build-openbsd-latest-clang	2m 52s
build-dragonflybsd-latest-gcc	2m 41s
lint-pcp-config	4s
build-ubuntu-latest-gcc-static	1m 15s
build-ubuntu-latest-clang-analyzer	2m 47s
build-netbsd-latest-gcc	3m 10s
build-freebsd-latest-clang	2m 10s
build-solaris-latest-gcc	7m 31s
lint-whitespace	3s
	35m 34s

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