* 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.
* Redisign idea
* Code cleanup
* Fixed to right container
* Reoredered layout
* Reordering panels
* Export dialog
* Removed redunant code
* Fixed not removing temp canvas
* Fixed preview not using only selected elements
* Returned file name on export
* Toggle export selected/all elements
* Hide copy to clipboard button if no support of clipboard
* Added border to swatches
* Fixed modal flickering
I profiled dragging and it looks like it takes ~3ms to save to localStorage a smallish scene and we're doing it twice per mousemove. Let's debounce so we don't pay that cost on every mouse move.
Stole the implementation from #220 which got reverted.
