This PR incorporates a crc method from
https://github.com/alexgorbatchev/crc into the library, removing a peer
dependency on `buffer`. This was causing build errors in apps that did
not include the buffer library. (Our codebase included buffer because of
vsce.)
### Change Type
- [x] `patch`
### Release Notes
- [@tldraw/editor] Remove peer dependency on buffer.
f1f584df94