Make code prettier

This updates ESLint and our shared eslint-config-openlayers to use Prettier.  Most formatting changes were automatically applied with this:

    npm run lint -- --fix

A few manual changes were required:

 * In `examples/offscreen-canvas.js`, the `//eslint-disable-line` comment needed to be moved to the appropriate line to disable the error about the `'worker-loader!./offscreen-canvas.worker.js'` import.
 * In `examples/webpack/exapmle-builder.js`, spaces could not be added after a couple `function`s for some reason.  While editing this, I reworked `ExampleBuilder` to be a class.
 * In `src/ol/format/WMSGetFeatureInfo.js`, the `// @ts-ignore` comment needed to be moved down one line so it applied to the `parsersNS` argument.

test/spec/ol/css.test.js

@@ -1,48 +1,54 @@
 import {getFontParameters} from '../../../src/ol/css.js';
 
-describe('ol.css', function() {
+describe('ol.css', function () {
+  describe('getFontParameters()', function () {
+    const cases = [
+      {
+        font: '2em "Open Sans"',
+        style: 'normal',
+        weight: 'normal',
+        families: ['"Open Sans"'],
+      },
+      {
+        font: "2em 'Open Sans'",
+        style: 'normal',
+        weight: 'normal',
+        families: ['"Open Sans"'],
+      },
+      {
+        font: '2em "Open Sans", sans-serif',
+        style: 'normal',
+        weight: 'normal',
+        families: ['"Open Sans"', 'sans-serif'],
+      },
+      {
+        font: 'italic small-caps bolder 16px/3 cursive',
+        style: 'italic',
+        weight: 'bolder',
+        families: ['cursive'],
+      },
+      {
+        font: 'garbage 2px input',
+        families: null,
+      },
+      {
+        font: '100% fantasy',
+        style: 'normal',
+        weight: 'normal',
+        families: ['fantasy'],
+      },
+    ];
 
-  describe('getFontParameters()', function() {
-    const cases = [{
-      font: '2em "Open Sans"',
-      style: 'normal',
-      weight: 'normal',
-      families: ['"Open Sans"']
-    }, {
-      font: '2em \'Open Sans\'',
-      style: 'normal',
-      weight: 'normal',
-      families: ['"Open Sans"']
-    }, {
-      font: '2em "Open Sans", sans-serif',
-      style: 'normal',
-      weight: 'normal',
-      families: ['"Open Sans"', 'sans-serif']
-    }, {
-      font: 'italic small-caps bolder 16px/3 cursive',
-      style: 'italic',
-      weight: 'bolder',
-      families: ['cursive']
-    }, {
-      font: 'garbage 2px input',
-      families: null
-    }, {
-      font: '100% fantasy',
-      style: 'normal',
-      weight: 'normal',
-      families: ['fantasy']
-    }];
-
-    cases.forEach(function(c, i) {
-      it('works for ' + c.font, function() {
+    cases.forEach(function (c, i) {
+      it('works for ' + c.font, function () {
         const font = getFontParameters(c.font);
         if (c.families === null) {
           expect(font).to.be(null);
           return;
         }
-        font.families.forEach(function(family, j) {
+        font.families.forEach(function (family, j) {
           // Safari uses single quotes for font families, so we have to do extra work
-          if (family.charAt(0) === '\'') {
+          if (family.charAt(0) === "'") {
             // we wouldn't want to do this in the lib since it doesn't properly escape quotes
             // but we know that our test cases don't include quotes in font names
             font.families[j] = '"' + family.slice(1, -1) + '"';
@@ -53,7 +59,5 @@ describe('ol.css', function() {
         expect(font.families).to.eql(c.families);
       });
     });
-
   });
-
 });