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.

src/ol/math.js

@@ -14,7 +14,6 @@ export function clamp(value, min, max) {
   return Math.min(Math.max(value, min), max);
 }
 
-
 /**
  * Return the hyperbolic cosine of a given number. The method will use the
  * native `Math.cosh` function if it is available, otherwise the hyperbolic
@@ -24,7 +23,7 @@ export function clamp(value, min, max) {
  * @param {number} x X.
  * @return {number} Hyperbolic cosine of x.
  */
-export const cosh = (function() {
+export const cosh = (function () {
   // Wrapped in a iife, to save the overhead of checking for the native
   // implementation on every invocation.
   let cosh;
@@ -33,14 +32,13 @@ export const cosh = (function() {
     cosh = Math.cosh;
   } else {
     // … else, use the reference implementation of MDN:
-    cosh = function(x) {
+    cosh = function (x) {
       const y = /** @type {Math} */ (Math).exp(x);
       return (y + 1 / y) / 2;
     };
   }
   return cosh;
-}());
-
+})();
 
 /**
  * Returns the square of the closest distance between the point (x, y) and the
@@ -69,7 +67,6 @@ export function squaredSegmentDistance(x, y, x1, y1, x2, y2) {
   return squaredDistance(x, y, x1, y1);
 }
 
-
 /**
  * Returns the square of the distance between the points (x1, y1) and (x2, y2).
  * @param {number} x1 X1.
@@ -84,7 +81,6 @@ export function squaredDistance(x1, y1, x2, y2) {
   return dx * dx + dy * dy;
 }
 
-
 /**
  * Solves system of linear equations using Gaussian elimination method.
  *
@@ -140,7 +136,6 @@ export function solveLinearSystem(mat) {
   return x;
 }
 
-
 /**
  * Converts radians to to degrees.
  *
@@ -148,10 +143,9 @@ export function solveLinearSystem(mat) {
  * @return {number} Angle in degrees.
  */
 export function toDegrees(angleInRadians) {
-  return angleInRadians * 180 / Math.PI;
+  return (angleInRadians * 180) / Math.PI;
 }
 
-
 /**
  * Converts degrees to radians.
  *
@@ -159,7 +153,7 @@ export function toDegrees(angleInRadians) {
  * @return {number} Angle in radians.
  */
 export function toRadians(angleInDegrees) {
-  return angleInDegrees * Math.PI / 180;
+  return (angleInDegrees * Math.PI) / 180;
 }
 
 /**