Make state tree data expandable/collapsible

[alex-dixon]

The tree visualization of the current realized state should be more legible.

The e a slots are relatively predictable in terms of size but the value slot is highly variable and potentially not a point of interest by default.

Implementing code folding for vectors and maps in the value slot and collapsing them by default can allow users to navigate by eid or attribute and see fully expanded values on demand.

Once implemented the state tree should be OK for the first release.

[alex-dixon]

Tree is more readable for reasonably sized value slots thanks to packed printer and uuid trimming. Folding not a must have for release at this time