Coordinator viewmodel ownership

[mkj-is]

Update of the architecture. As we decided in the past, the ownership of the coordinator is tranferred from view controller to the view model.

Some more changes and improvements must have been done during the change:

• Removal of Coordinated protocol
• So the controller does not have the ability to access coordinator and view controllers directly, two protocols are used. The one for coordinator describes all navigation methods that the coordinator has. Coordinator input protocol has all methods for returning values and sending changes to view controller.
• Forgotten navigate method was removed from coordinators.
• Configuration block was changed to configure method which is much simpler to use. (No need to use [weak self] or [unowned self], lazy etc.)
• One test with example scene and its navigation was created.
• The view model is now created lazily by the child coordinator. It is no more created in the parent navigation coordinator, this prevents code repetition in navigation methods.

[zvonicek]

Mostly discussed in person.