Entities UI improvements

[jackjt8]

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.