Kashira

I found that there was some kind of error when trying to slice the "Kashira" part of dylan3dprint's Uzui Katana v2. I slightly redesigned the part so that it would cover the missing part of the file. It should still fit the same as the original but I did have to make the part from scratch so there is a chance to have some minor discrepancies, and I have not yet printed the part yet. If there are any issues please let me know so I can fix them.