The Great Webpack Update.

* Update to version 4 of webpack.
* For that matter, update *every dependency* to the latest available version.
* Remove the babel build target for Edge, as it doesn't seem to be necessary with webpack 4 and tenser.
* Add support for optional chaining and nullish coalescing via Babel transformations.
* Update the clips domain version to work better. Or at all, really.
* Remove unused code from i18n.
* Remove the last `<style>` from vue component files. They don't work that way now anyways.
* Fix a bug in Raven's report handler.
* Fix a bug with the menu button in browsers that don't understand `:scope` within `querySelector()`.

src/utilities/compat/webmunch.js

@@ -6,7 +6,7 @@
 // ============================================================================
 
 import Module from 'utilities/module';
-import {has, once} from 'utilities/object';
+import {has} from 'utilities/object';
 
 
 let last_muncher = 0;

src/utilities/time.js

@@ -32,8 +32,8 @@ export function duration_to_string(elapsed, separate_days, days_only, no_hours,
 
 
 export function print_duration(seconds) {
-	let minutes = Math.floor(seconds / 60),
-		hours = Math.floor(minutes / 60);
+	let minutes = Math.floor(seconds / 60);
+	const hours = Math.floor(minutes / 60);
 
 	minutes %= 60;
 	seconds %= 60;

src/utilities/translation-core.js

@@ -445,7 +445,7 @@ export default class TranslationCore {
 		if ( locale == null )
 			locale = this.locale;
 
-		let val = get(node.v, data);
+		const val = get(node.v, data);
 		if ( val == null )
 			return null;
 

src/utilities/twitch-data.js

@@ -173,7 +173,7 @@ export default class TwitchData extends Module {
 	// ========================================================================
 
 	getStreamMeta(id, login) {
-		return new Promise(async (s, f) => {
+		return new Promise((s, f) => {
 			if ( id ) {
 				if ( this._waiting_stream_ids.has(id) )
 					this._waiting_stream_ids.get(id).push([s, f]);