Canvas overlays needs HiDPI fixes

[rodlie]

The canvas overlays don't work with HiDPI.

[rodlie]

Issues I create are mostly for my own reference, so they might be lacking, just ask if this is something you want to work on etc.

This issue tracks the progress of fixing the canvas overlays for hidpi, currently node points, pivot points etc don't scale as they should (they are too tiny), it's a matter of adding pixel ratio where needed.

Not a big issue, but should be looked at before next release.

[rodlie]

I got a fix (minimal testing on Linux/X11 with 4k 200%), will check Windows etc later today.

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