Add the Mirror node

[0HyperCube]

This node should take in vector data, a boolean for "Mirror X", and a boolean for "Mirror Y". The centre of transformation should probably be around the pivot (indicated in the document with a blue circle inside another blue circle). If both mirror x and y are active, 4 copies of the vector data will be output. The default values should be true for mirror x and false for mirror y. This is similar to the mirror node in blender.

A guide to the node system can be found https://github.com/GraphiteEditor/Graphite/blob/master/node-graph/README.md - if you have any questions please ask in the discord chat.

Steps:

• Define a new node that just outputs the vector data that has been input (to ensure nodes are set up properly). This is similar to the circular repeat node.
• Compute the pivot position of the vector data using the appropriate function. You can log this to ensure that it is correct.
• Clone the subpaths in the vector data and mirror all of the positions around the computed pivot. You may need to modify the bézier_rs library and the VectorData struct.

[unholyleona]

Hey, I'd like to work on that issue :)

[0HyperCube]

@unholyleona If you need any help, feel free to submit a draft PR.

[Keavon]

@skoriop please comment "Ok" so I can assign you to this issue.

[skoriop]

Ok