Proposal: Move Migration/Schema Tools out of Pop

[markbates]

Currently the migration and schema management tools are tied tightly to pop. I feel as though these tools, representing a bulk of the soda command should be moved to gobuffalo/fizz.

These rebuilt tools can be used by Pop, Gorm, etc... independently. These tools should strive to use only the std lib sql package. If that's not easily do-able, then sqlx will be allowed, but nothing else beyond that.

In addition to allowing projects, such as Pop and Buffalo, to continue using these tools, we can make them available to the wider Go community as whole who need things like migrations, but don't want to use something such as Pop.

[duckbrain]

My understanding is that this has been completed. https://github.com/gobuffalo/fizz, should issue still be open?