Add support for Node components

[LeStegii]

Is your feature request related to a problem? Please describe.
Currently, Components have to extend from Parent which makes it impossible to use classes like ImageView or Shape as the main component class as they don't extend from Parent.

Describe the solution you'd like
Lowering the requirement for components to extend Node instead of Parent would resolve this problem.
This would require some tweaks to show als the Scene only takes Parents as a parameter.

Describe alternatives you've considered
The classes not extending from parent could be wrapped in a parent, but this requires boilerplate.