Change Types.fabric

[woeps]

Types.fabric shall be changed to be a record: {name, fn: 'a => content} because a fabricator should already be able to name it's created fabrics. The name will be the file-path by convention.

This change will enable refabricators to implement actions depending on the fabric's name without actually calling the fabric's function. e.g for Lib.Refabricators.filterbyExtenstion() (#6)