Update dependencies and rendering logic to use zCanvas 6.0.1

[igorski]

Update to use new zCanvas 6 API with all its performance improvements.

TODO / Known issues

• Layer scale and rotation should propagate onto DrawContext of LayerSprite
• Use DrawContext for optimized transformations
• Cloned strokes need to getImageData() from Canvas which is async <- this might prevent Worker use
• Cannot use Worker optimization yet
• On Document load / mouse hover canvas zoom seems to be the max
• isVisible checks seem to be inaccurate (text not visible at all zoom levels)
• Use ImageBitmap instead of HTMLCanvasElement for all temp content?
• Typechecks fail