OpenForge 2.0 Cut-Stone Low Curved

Cut-Stone Low Curved Walls have now been updated to meet the current standards of OpenForge. You can build these either as a curved wall with a floor on one side, or a curved wall with a floor on both sides

For instructions on how to get started with OpenForge, we have a set of [tutorials](https://github.com/devonjones/openforge-tutorials/blob/master/README.md). Want to sell OpenForge prints? Want to use OpenForge designs in your product, check out the [license](https://github.com/devonjone