Draft: Resolve "Use SVG for drawing"

Closes #134

• Ensure imports are working correctly https://github.com/parcel-bundler/parcel/issues/1547#issuecomment-397630691 https://github.com/benevolarX/parcel-preact-typescript-boilerplate/blob/master/.babelrc
• Change canvas ids to drawing
• Add changeView event (#43)
• Bump draft version and store image position and top-left position rather than center of image
• Add UI tests to ensure canvas and svg work the same (#46)
  • Create a test server from the dev server
    • Starts testcafe in live mode
    • Creates a socket server that proxies messages between the UI and the test
  • Create a helper for the tests that
    • connects to the socket proxy for the messages
    • can send a blank draft

Resources

• https://github.com/ynakajima/polyline2bezier http://ynakajima.github.io/polyline2bezier/