TODO: Besides splitting this out from previous commit, should really avoid markdown field in favor of modifying jsdoc to report wherever it lays out "prettyprint"; still probably missing some one-liners; see https://github.com/google/code-prettify; update builds to confirm new stackblur is working; add below to CHANGES; add back for eslint-plugin-jsdoc once merged (though need new version ^3.9.1); move any linting changes to other linting branch

- Refactoring (minor): Add favicon to canvas demo
- Linting (ESLint Markdown JavaScript): Add `eslint-plugin-markdown` with
  slightly loosened config (`no-undef` and `padded-blocks` off and
  `no-unused-vars` as a warning)
- Linting (ESLint JSDoc code comments): Add `eslint-plugin-jsdoc` and apply to
    JSDoc code comments
- Linting (ESLint): Completely avoid unescaped tabs in files
- Docs (Linting): Add linting info file
- npm: Rename `copy-deps` script to `copy`
- Refactoring: Add stackblur-canvas as a dependency and copy it in (until such time as we can do so for canvg)

test/sanitize_test.js

@@ -15,7 +15,7 @@ QUnit.test('Test sanitizeSvg() strips ws from style attr', function (assert) {
   assert.expect(2);
 
   const rect = document.createElementNS(NS.SVG, 'rect');
-  rect.setAttribute('style', 'stroke: blue ;		stroke-width :		40;');
+  rect.setAttribute('style', 'stroke: blue ;\t\tstroke-width :\t\t40;');
   // sanitizeSvg() requires the node to have a parent and a document.
   svg.append(rect);
   sanitize.sanitizeSvg(rect);