upgrade to webpack 4

Squashed commits:
[6c232b9] More WebPack 4 wip
[c4369c3] Attempt to remove lodash
[ce53aad] Packages cleanup
[155124d] Better enqueue for scripts
[7b2cd68] Upgraded to webpack 4 + assets performance

.babelrc

@@ -1,4 +1,4 @@
 {
 	"plugins": [ "lodash" ],
-	"presets": [ "@wordpress/default" ]
+	"presets": [ ["@wordpress/default", { "modules": true } ] ]
 }

.prettierrc

@@ -0,0 +1,10 @@
+useTabs: true
+tabWidth: 4
+printWidth: 80
+singleQuote: true
+trailingComma: es5
+bracketSpacing: true
+parenSpacing: true
+jsxBracketSameLine: false
+semi: true
+arrowParens: always

bundlesize.config.json

@@ -0,0 +1,16 @@
+{
+	"files": [
+		{
+			"path": "./dist/js/*.js",
+			"maxSize": "300 kB"
+		},
+		{
+			"path": "./dist/js/*frontend*.js",
+			"maxSize": "130 kB"
+		},
+		{
+			"path": "./dist/css/*.css",
+			"maxSize": "100kB"
+		}
+	]
+}