Change markers to types

Meaning root should be named just Type or RootType.

https://github.com/linksplatform/Data.Doublets.Json/blob/eac0583ca58f992e338352f3e755b4674f479e10/csharp/Platform.Data.Doublets.Json/DefaultJsonStorage.cs#L280-L281

Each marker is just type "inherited" from root type. So, marker links should be like this: (Object: Type -> Object)

https://github.com/linksplatform/Data.Doublets.Json/blob/eac0583ca58f992e338352f3e755b4674f479e10/csharp/Platform.Data.Doublets.Json/DefaultJsonStorage.cs#L284-L296

Each marker can be named just Object or ObjectType instead of "marker".

The basic type system is like this:

Type -> Type
Type -> Value

So everything that comes after Type is Type or Value. Meaning, we can have infinite depth hierarchy of types. The special case of type is a concrete value (constant of some type).

For example, we can have:

(Array: Type -> Array)
(EmptyArray: Array -> EmptyArray)

Meaning that Array is type. And EmptyArray is concrete value (constant) of type Array.

Each value/constant is still type. Each type can be used as a standalone constant.

Start by reading the linked sections of csharp/Platform.Data.Doublets.Json/DefaultJsonStorage.cs around lines 280-296. Trace how markers and the root type are represented, then compare the result with the Type, Value, Array, and EmptyArray examples in the issue. Done means the representation follows the proposed type hierarchy and naming consistently.