Remove as many feature = "std" gates in tests as possible
#495
| Job | Run time |
|---|---|
| 4s | |
| 36s | |
| 20s | |
| 9m 54s | |
| 13s | |
| 2m 4s | |
| 2m 57s | |
| 2m 49s | |
| 22s | |
| 3m 32s | |
| 1m 6s | |
| 3m 8s | |
| 6m 36s | |
| 3m 26s | |
| 3s | |
| 37m 10s |