- Remove unused footnote section title option
- Move away from maintaining a list of footnotes in the document (only needed
for html export, potential maintainance overhead when modifying the document)
and rather only build it on export when required.
- HTML export: Rename all footnotes to numbers (so we can support anonymous
footnote references by assigning them a number) and export footnotes in order
of reference, not definition. The implementation of this makes it natural to
also stop exporting unused footnote definitions so we do that as well.
HTMLWriter uses the document to look up export options and adapt it's
behaviour. The writer.document & log are set in the Before() method during
normal use via document.Write().
Sometimes the writer is used separately and won't have it's Before method
called - in those cases we should use the defaults rather than crashing.
TIL embedded types can be acessed by their non-namespaced name - so there
actually is no need for a type alias to access .strings.Builder, one can just
use .Builder.
The existing approach made it hard to extend existing writers.
With this change, replacing individual methods of a writer is possible by
embedding it.
Sharing the WriteNodes function also removes some unnecesseray duplication, so
win win.
Hugo has some hardcoded checks that have to be fulfilled in its Table of
Contents extraction workflow (helpers/content ExtractTOC). It's easier this
way...
