* Stop using getTransform
Fixes#861
The original motivation behind this is to make it work with Firefox. But it also helped make the code more intentional.
Test Plan:
- Create one square, select it, zoom in repeatedly, make sure that it zooms centered in the screen and everything looks good
- Scroll at various zoom levels, things look good
- Export a small scene at 1x and 3x, make sure the background is properly set and look good
* fix selection element
* Zoom icons.
* Actions.
* Min zoom of 0 does not make sense.
* Zoom logic.
* Modify how zoom affects selection rendering.
* More precise scrollbar dimensions.
* Adjust elements visibility and scrollbars.
* Normalized canvas width and height.
* Apply zoom to resize test.
* [WIP] Zoom using canvas center as an origin.
* Undo zoom on `getScrollBars`.
* WIP: center zoom origin via scroll
* This was wrong for sure.
* Finish scaling using center as origin.
* Almost there.
* Scroll offset should be not part of zoom transforms.
* Better naming.
* Wheel movement should be the same no matter the zoom level.
* Panning movement should be the same no matter the zoom level.
* Fix elements pasting.
* Fix text WYSIWGT.
* Fix scrollbars and visibility.
