Add built-in policies #53

Job	Run time
Minimal versions	20s
Check Documentation	21s
Check Format and Clippy	17s
Test (nightly, ubuntu-latest, nightly)	22s
Test (win32, windows-latest, stable-i686-pc-windows-msvc)	56s
Test (stable, ubuntu-latest, stable)	15s
Test (beta, ubuntu-latest, beta)	22s
Test (mingw, windows-latest, stable-x86_64-pc-windows-gnu)	1m 15s
Test (win64, windows-latest, stable-x86_64-pc-windows-msvc)	1m 4s
Test (macos, macos-latest, stable)	17s
	5m 29s

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