UI Extraction filtering

[ickshonpe]

What problem does this solve or what need does it fill?

At the moment if you add a custom UI extraction function there is no way to disable the built-in extraction, so you have to create new components and systems as well.

For example, imagine you want to create an SdfTextPlugin that renders text using SDFs. A naive implementation would add an extract_sdf_text_uinodes function to the extract schedule that queries for the text components and an SdfText marker component. But this won't work as the extract_text_uinodes function will find the same text components and the text will be extracted and rendered twice.

Instead, you would need to make SdfText into a newtype that wraps Text and reimplement all the text systems with queries for SdfText instead of Text, replicating hundreds of lines of code.

What solution would you like?

Add marker components to all the UI node bundles that the extraction functions can filter on.
Nodebundle and ImageBundle would have ExtractUiNode and ExtractUiNodeBorder components, and TextBundle would also have an ExtractUiNodeText, etc.