* Get rid of isSelected, canvas, canvasZoom, canvasOffsetX and canvasOffsetY on ExcalidrawElement.
* Fix most unit tests. Fix cmd a. Fix alt drag
* Focus on paste
* shift select should include previously selected items
* Fix last test
* Move this.shape out of ExcalidrawElement and into a WeakMap
* first draft of export to SVG. WIP
* enabled text rendeing - which is not quite right atm
* placeholder svg icon
* size the canvas based on the bounding box of elements
* Do not add opacity attributes if default
* render background rect
* Ensure arrows are in the same SVG group
* parse font-size from font
* export web fonts
* use fixed locations for fonts
* Rename export functions
* renamed export file
* oops broke the icon.
This updates the way fonts are handled to not have to download the font from the internet.
If you do `./public/font.ttf` in the .scss file, unfortunately the bundle packages them somewhere that's different from the public folder that is used by the index.html to preload them.
The fix I used is to use absolute path `/font.ttf` so that both work. Unfortunately, this means that the website will only work if at the root of the domain. That's the case so far so it's okay but still annoying if we want to embed it somewhere.
