Load visualisations in web worker

[rolyp]

Should solve the “unresponsive page” problem. Web workers are specifically designed for this sort of issue. The main difficulty will be that fluid.js contains a fair bit of DOM-manipulating code (mainly using d3.js to make new elements and insert them into the page), but web workers don’t have direct access to the DOM.

• Initial experiment: put importScripts('fluid.js') into a worker and run from index.html
• Separate creation of chart element from insertion into DOM
  • Return (id $\mapsto$ fig) map from PureScript main?
  • Break dependency on d3-selection (and other d3 modules that use DOM)?
• import { loadFig } from ('./output/App/Fig/index.js') idiom to run PureScript functions directly?
  • Drop runAffs helper for processing arrays of Aff, in favour of runAff'
  • drawFig’, drawFile’ specialisations of runAff'

See also:

• 0.7.5 website changes #1172
• Build graph imperatively #1008

[rolyp]

@RaoOfPhysics FYI