Docs: keep inherited stuff within the component

[vkrv]

Add to documentation to particular component information about it's inheritance tree (e.g. WebItem->Rectangle->Item), so inherited properties and methods can be easily accessible. Having kind of inheritance structure would be nice: "interits": { "name": "Rectangle", "ref": "core/Ractangle", "inherits": { "name": "Item", "ref": "core/Item", "inherits": { "name": "Object", "ref": null, "inherits": null } } }