Revert "Remove modules crc32 and std.md5 which had been deprecated by 6ff6adc5bf7d13b33e27985c53377cd20d7648e6"

This reverts commit ecbc04f90d21303fd72d9ecfd501df15f49515a2.
Merge pull request #1803 from monarchdodra/revertDeprecate

Revert "Remove modules crc32 and std.md5 which had been deprecated by 6f...