Rename `default` to `generic` #188

Job	Run time
Fuzz	38s
feature checks	28s
Miri (x86_64-unknown-linux-gnu, --no-default-features)	1m 9s
Miri (x86_64-unknown-linux-gnu)	1m 8s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 15s
Miri (aarch64-unknown-linux-gnu, --no-default-features)	1m 22s
Miri (aarch64-unknown-linux-gnu)	1m 10s
Test (x86_64-unknown-linux-gnu, nightly)	24s
Test (x86_64-unknown-linux-gnu, beta)	28s
Test (x86_64-unknown-linux-gnu, stable)	34s
Test (x86_64-unknown-linux-gnu, 1.64)	29s
Test (aarch64-unknown-linux-gnu, nightly)	1m 4s
Test (aarch64-unknown-linux-gnu, beta)	1m 0s
Test (aarch64-unknown-linux-gnu, stable)	50s
Test (aarch64-unknown-linux-gnu, 1.64)	57s
Clippy	22s
docs	21s
fmt	17s
Outdated	8s
	14m 4s

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