Model state view

[lukavdplas]

For #10 , we will need components that can show the current state of a model to the user.

To do:

• Create a component that will show the current state of the model.
• The model should get the state as input, so we can reuse this component whenever we want to show the model state.
• It's probably good to divide this into child components (for declarative memory, environment, etc.).
• The contents can be pretty basic (e.g. a table with values) - we can refine this later.