Create components hierarchy within their initialization cycle

[F0rsaken]

When component is initialized it can connect itself to parent component, 'cause we can set current parent context and change it dynamically. Best data structure for that would be stack.

This is more problematic when components are created dynamically. Then we should find nearest parent in DOM.

Another edge case are slots and teleportation of components. We need to test how that would behave and how changing render target in template components could affect it.