Question for @trimental since I'm not familiar with the new text system (and was only vaguely familiar with the last one)

It seems like the proper way to handle anchor links now that we support footnotes is to have the anchor attached to the text within a textbox instead of the textbox itself. This way we can have multiple anchors in the same textbox e.g.

This textbox[^1] has two footnotes[^2]

and we can have positioning right in terms of anchors within a textbox e.g. if the above text ran over multiple lines then we want the anchor to be attached to the correct line within the textbox. If this wasn't the case then we could just have a vec of anchors for a textbox and call it a day

I'm opening this issue because I'm not really sure what the appropriate way to figure out the position of text within a textbox. After getting that figured out it should be simple enough to implement the above