New Library Release - Lib: DFreds Migrations

Hi all!

I've released a new module for helping developers (and myself) run migrations in their modules.

Generally, this won't affect a standard user of Foundry, but you will likely be required to download it as a dependency in the near future for my modules like Convenient Effects and Status Effects.

For my developers, check out the wiki page for details, and let me know if you have any questions.