Viewer: Selection of one or more elements via tree view

[aozien]

This PR closes #568

This adds the capability to select multiple elements from the side tree view

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[pablo-mayrgundter]

Nice!

Please add a unit test in NavTree.test.jsx.

This is a nice example of should be easy to test, but also easy to break without realizing it, so good to start testing.

[aozien]

Hi @pablo-mayrgundter , I added a test for the NavTree component, the component doesn't manage it's own selection state anymore, instead, the current selected elements are all managed in the CadView component, so that's why the test is limited to the click/ shift click event, let me know what you think :)

[Adrian62D]

@aozien Will this also close #541 ?

[aozien]

@Adrian62D this PR doesn't affect any widget API functionality, however, you can already use the widget API to:
1- select multiple elements
2- remove a selected element and set a new selection (deselection)
3- clear all (set selection to empty array)
the only functionality that's missing from the app and the widget is Select All