Add unique id base methods

/to @bajtos 

This refactors all identifiers for workspace entities. It uses the `idName(model)` and provides the right value based on the configuration of the entity (in `models.json`). By default it will set

`idName =  componentName` + `name`

In `models.json` we can set an additional id part to create a more specific id when required. 

 `componentName` + `modelName` + `name`
> `PropertyValidation` should have `componentName` since it exists within a component.

I'd say that `PropertyValidation` should inherit `componentName` from the `ModelDefinition` it belongs to, i.e. it should not have `componentName` property.

For the July milestone, do whatever is easier.