Scene object events for XRayed, Highlighted and Selected

[mlankamp]

Enabled the scene to fire events when an entity is x-rayed, highlighted or selected. This behavior is similar to the visibility updated event.

The TreeViewPlugin has been updated to listen to the objectXRayed event, this allows the treeview to use a different styling for x-rayed entities. As soon as this is merged, the following can be added to the xeokit-bim-viewer stylesheet:

.xeokit-objectsTab .xrayed-node,
.xeokit-storeysTab .xrayed-node,
.xeokit-classesTab .xrayed-node { /* Appearance of xrayed node */
    color: rgba(0, 0, 0, 0.3);
}

Typescript typing also updated

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