* Initial commit. Feature works, but code might need some cleanup
* Cleaned up diff
* Made mousePosition a XYPosition again so its nicely typed
* Fixed yarn issues
* Paste now properly takes node width/height into account when pasting
* feat(ui): use react's types in the `onMouseMove` `reactflow` handler
* feat(ui): use refs to access `reactflow`'s DOM elements
* feat(ui): use a ref to store cursor position in nodes
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Co-authored-by: psychedelicious <4822129+psychedelicious@users.noreply.github.com>