Harmonize all Entity Tree visualizations

[nikolausWest]

What is shown as content of a Space View in the Blueprint View is an Entity Tree. Under the hood it's the result of applying a query, which is specified in the Space View Blueprint. That query can include selecting multiple sub-trees from the EntityStore, transforming / overriding some of it, plus adding some new inline data (e.g. a background mesh). However, even after all that, the thing you klick on in is still an Entity Tree, just like what you see in the Streams View, and that should be conveyed visually.

First things to try

We've made a decision on the first things to try.

• Remove the "group" concept from the Entity Tree in the Blueprint
• Use the entity and component icons everywhere (Blueprint View, Streams View, Entity Query Modal)
  • If this ends up looking too cluttered, improve the icons

Background / more context

• Very related: Update DataResultTree to start at origin and introduce "projected" subspace #4156

The goal is to make it obvious that Entity Trees in different parts of the UI are the same thing. We currently show three different Entity Trees:

Streams View

Blueprint View

Entity Query Modal

Related but not exactly on topic

• Many people don't like using the Entity Tree in the Streams View to find and explore data. Could that be improved?
• Is there some way to do away with the "Edit Entity Query" modal while still giving a graphical representation of the query?
  • Related: Hide Entity path filter UI until it's less confusing and easier to use #4634