Entities UI improvements

**Scene Tab**

- Load entities - Does not list all entity types to allow quickly toggling groups on/off. Given this is a collapsible element, we could have two/three columns of toggles rather than just one.

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**Entity Tab**

Currently we can only sort by Entity `Name` and `Kind`.

Additional options to make finding things easier:
- Search
- Filter

Quickly change multiple entities:
- Multi-selection lets you alter common settings of the selected entities in addition to remove said entities.