[Feature] added canvas panning option using middle mouse toggle

Rukshan Senanayaka requested to merge RukshanJS/purr-data:master into master

This is a fix to the issue #828

known issue:

The viewBox attribute of the patchsvg resets its x and y to zero when, start panning again and when add a new object to the canvas. Should save the previous x and y instead.


@jwilkes @aggraef @ico Could you please review this.

Edited by Rukshan Senanayaka

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