Outliner/Tree-view ideas

[doup]

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• show the tree view with icons so it's easy to identity "entity type" (there aren't types, but something can be inferred by the used components)
• filter
• drag/drop reorder tree view, change parent/children relation
• uses Name component to show name in list; renaming the entity changes the Name component
• can the outliner/tree-view tool be generalized for relations?
• clicking on an entity selects it and shows its component in the "entity inspector", multiple entities can be selected in the outliner