I just issued a pull request to the existing OneWire library on the web IDE. I thought this would be better than publishing a new OneWire library, because then there would be multiple versions on the web IDE, some that support the Photon and some that don’t. If the maintainer of that library merges the pull request, then we’re good to go. It looks like they haven’t been on github in a while though, so if they don’t, then we can publish a new library or something.
@Carsten4207 if you want to contribute to a library, I think they best way is to fork it on github, make a change, then submit a pull request. It doesn’t look like OneWire is an official library the way SPI or something is, so anyone can contribute. Once the discussion about PIN_MAP gets sorted out, there will likely need to be some updates to the OneWire library!