Move SkipRegex impls to the toplevel. #196

Job	Run time
Clippy (ubuntu-latest)	17s
Examples Bench (ubuntu-latest)	2m 26s
Internals Bench (ubuntu-latest)	26s
Clippy (macos-latest)	17s
Examples Bench (macos-latest)	2m 29s
Examples Test (ubuntu-latest, stable)	1m 5s
Internals Bench (macos-latest)	25s
Clippy (windows-latest)	19s
Examples Bench (windows-latest)	4m 39s
Examples Test (ubuntu-latest, nightly)	57s
Internals Bench (windows-latest)	1m 54s
Examples Test (macos-latest, stable)	1m 1s
Rustdoc	25s
Rustfmt	4s
Examples Test (macos-latest, nightly)	1m 1s
Unit Test (ubuntu-latest, stable)	43s
Unit Test (Miri)	1m 29s
Examples Test (windows-latest, stable)	2m 35s
Unit Test (ubuntu-latest, nightly)	37s
Examples Test (windows-latest, nightly)	1m 48s
Unit Test (macos-latest, stable)	29s
Unit Test (macos-latest, nightly)	50s
Unit Test (windows-latest, stable)	2m 17s
Unit Test (windows-latest, nightly)	1m 9s
	29m 42s

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