* ExtractUiNode
* ExtractUiNodeBorder
* ExtractUiNodeText
* ExtractUiNodeAtlasImage
These are added to the relevant UI node bundles.

The UI's extraction functions now have query filters that allow selective extraction of UI node entities:
* `extract_uinode` has filter `With<ExtractUiNode>`
* `extract_uinode_borders` has filter `With<ExtractUiNodeBorder>`
* `extract_text_uinodes` has filter `With<ExtractUiNodeText>`
* `extract_atlas_uinodes` has filter `With<ExtractUiNodeAtlasImage>`

* Renamed `_with_size` functions to `_with_context`

* Added a `viewport_size` parameter to its methods:
- `evaluate`
- `try_add_with_context`
- `try_add_assign_with_context`
- `try_sub_with_context`
- `try_sub_assign_with_context`

* Added support for the viewport `Val` variants to `evaluate`

This reverts commit 0a88bb5.

…actions.

Further tweak to comments.