* Add Glob wrapper type with better serialization
* Introduce PathIgnoreRule struct
* Implement equality for Glob type
* Add PathIgnoreRule to InstanceContext
* Implement glob ignores in directory middleware
* Fix up filters
* Use Iterator::all instead of loop
* Add project-level configuration for glob ignores
* Add test project for glob ignores
* Wire up project file and snapshots to make glob ignores work
* Better codepaths for adding ignore rules with empty iterators
* Add test for globs inherited from parent projects
* Add test details, support glob ignores in nested projects
* Add feature flag for globs
* Switch to use ExactSizeIterator instead of size_hint
* Remove glob visitor
- JSON model names now come from the file name
- The 'Name' field is now optional for the top-level instance
- Snapshot tests run way faster by executing Rojo directly instead of Cargo
