Scrollview remove entity reference #7206
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This PR depends on #7194 and #7204 (and includes them already), merge them first please so diff is more concise.
This PR does not change API or behavior.
As mentioned in #7195 - EntityRefence need to go. This PR completes that, by removing a last dependency on it and also removing reliance on ComponentSystem's global event lists, which leads to exponentially higher costs of creating/removing related components (Element especially).
There is a significant performance improvement when creating/removing such components similar to other two PR's mentioned above. This also benefits ElementComponent's creation/removal performance, as every ScrollView and Scrollbar components were subscribing to ElementComponentSystem's global lists.
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