Add built-in policies #56

Job	Run time
Check Documentation	22s
Minimal versions	20s
Check Format and Clippy	18s
Test (beta, ubuntu-latest, beta)	25s
Test (win64, windows-latest, stable-x86_64-pc-windows-msvc)	1m 15s
Test (nightly, ubuntu-latest, nightly)	22s
Test (win32, windows-latest, stable-i686-pc-windows-msvc)	1m 0s
Test (macos, macos-latest, stable)	25s
Test (mingw, windows-latest, stable-x86_64-pc-windows-gnu)	57s
Test (stable, ubuntu-latest, stable)	20s
	5m 44s

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