Build/Test Tools: Support NodeJS 14.x in the 5.0 branch.

This updates the 5.0 branch to support the latest LTS version of NodeJS (currently 14.x), allowing the same version to be used across all WordPress branches that receive security updates as a courtesy.

In addition to backporting the package updates that happened after branching 5.0, dependencies that were removed in future releases have also been updated to their latest versions.

Props desrosj, dd32, netweb, jorbin.
Merges [44233,44728,45321,45765,45826,46403-46404,46408,46409,47404,47867-47869,47872-47873,48705,49636,49933,49937,49939,49940,49983,49989,50017,50126,50176,50185,50192] to the 5.0 branch.
See #52341.

git-svn-id: https://develop.svn.wordpress.org/branches/5.0@50201 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

.nvmrc

@@ -1 +1 @@
-10.22.1
+14

Gruntfile.js

@@ -9,7 +9,8 @@ module.exports = function(grunt) {
 		SOURCE_DIR = 'src/',
 		BUILD_DIR = 'build/',
  		BANNER_TEXT = '/*! This file is auto-generated */',
-		autoprefixer = require( 'autoprefixer' );
+		autoprefixer = require( 'autoprefixer' ),
+		sass = require( 'sass' );
 
 	// Load tasks.
 	require('matchdep').filterDev(['grunt-*', '!grunt-legacy-util']).forEach( grunt.loadNpmTasks );
@@ -22,18 +23,6 @@ module.exports = function(grunt) {
 			options: {
 				processors: [
 					autoprefixer({
-						browsers: [
-							'> 1%',
-							'ie >= 11',
-							'last 1 Android versions',
-							'last 1 ChromeAndroid versions',
-							'last 2 Chrome versions',
-							'last 2 Firefox versions',
-							'last 2 Safari versions',
-							'last 2 iOS versions',
-							'last 2 Edge versions',
-							'last 2 Opera versions'
-						],
 						cascade: false
 					})
 				]
@@ -184,7 +173,7 @@ module.exports = function(grunt) {
 				ext: '.css',
 				src: ['wp-admin/css/colors/*/colors.scss'],
 				options: {
-					outputStyle: 'expanded'
+					implementation: sass
 				}
 			}
 		},
@@ -485,8 +474,9 @@ module.exports = function(grunt) {
 		},
 		uglify: {
 			options: {
-				ASCIIOnly: true,
-				screwIE8: false
+				output: {
+					ascii_only: true
+				}
 			},
 			core: {
 				expand: true,
@@ -542,7 +532,9 @@ module.exports = function(grunt) {
 			jqueryui: {
 				options: {
 					// Preserve comments that start with a bang.
-					preserveComments: /^!/
+					output: {
+						comments: /^!/
+					}
 				},
 				expand: true,
 				cwd: SOURCE_DIR,
@@ -553,7 +545,9 @@ module.exports = function(grunt) {
 			masonry: {
 				options: {
 					// Preserve comments that start with a bang.
-					preserveComments: /^!/
+					output: {
+						comments: /^!/
+					}
 				},
 				src: SOURCE_DIR + 'wp-includes/js/jquery/jquery.masonry.js',
 				dest: SOURCE_DIR + 'wp-includes/js/jquery/jquery.masonry.min.js'