Add built-in policies #59

Job	Run time
Check Documentation	20s
Minimal versions	18s
Test (nightly, ubuntu-latest, nightly)	24s
Check Format and Clippy	12s
Test (macos, macos-latest, stable)	26s
Test (win32, windows-latest, stable-i686-pc-windows-msvc)	1m 20s
Test (win64, windows-latest, stable-x86_64-pc-windows-msvc)	2m 4s
Test (stable, ubuntu-latest, stable)	22s
Test (beta, ubuntu-latest, beta)	25s
Test (mingw, windows-latest, stable-x86_64-pc-windows-gnu)	1m 4s
	6m 55s

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