Merge in FRAG/50ohm.de from feature/references to main
* commit '1334e9c9060f9c17e6cbe0e1fe5ff5d9bd7b84fa':
fix: use quotes for html attributes
fix: deleted render_references restored
feat: Renderer add interim references with default values
Merge in FRAG/50ohm.de from feature/spaces to main
* commit '641d1c94ded5b817c613cd38738dbe0b51e3b55c':
refactor: Fixed desired ... handling and more tests
feat: Renderer add nonbreakable spaces and halfwidth spaces