[NP-6345] Prevent detail views from recursively rendering

[KernelDeimos]

It is possible for properties to be recursive, and these properties crash detail views.

For example, the factory for view on a foam.nanos.menu.Menu introduces recursion:

factory: function() { return { class: 'foam.u2.view.MenuView', menu: this }; }

What Won't Work

There is a very narrow subset of appropriate solutions to this problem. Here are just a few things that don't work:

• A low-level solution, such as a Context decorator to prevent duplicate data references, would prevent the flexibility to have the same data passed to child views.
• Taking into account the data plus the class of the view would seem to avoid repetition, but some views may display different information for the same data depending on other view properties. (looking at you, SectionView)
• Taking into account all properties of a view will not prevent infinite recursion. Maybe one property is a sequence number or randomly generated value.

The only general solution for all views would then involve detecting whether the render function of a view will halt or not. This we know to be impossible, as it is the definition of the Halting Problem.

What Did Work

While there's no solution for all views, infinite recursion can be avoided on a subset of views with known behaviour. Providing a convention and tools to handle this will allow anyone to add a view to this subset.

This PR adds a referencePath context value.

• Every detail view adds its data to this path.
• Every detail view, when rendering a property, uses RecursionSafePropertyView
• MapView, and any view we want to be safe from recursion, also checks this path

Example introducing recursion to a property:

Example of detail view for this property: