The great repo filesystem restructure

This commit *only* moves files. There are *no code changes*.

* All JSON converters are now in `Converters`.
* All Network related things are now in `Net`.
* `RelationshipResolver.cs` is now in `Relationships`.
* `Module.cs` is now in `Types`.
Merge pull request #388 from pjf/rename

The great repo filesystem restructure