Maintenance: Use webpack 5 with esbuild, instead of rspack (#181)

This fixes issues that were only noticed in production when switching to rspack. Specifically, swc (the transpiler used by rspack) has some opinionated behaviors that break certain FFZ workflows.

As a bonus, this seems to be faster? Somehow? I don't get it, but hurrah.

[skip ci]

jsconfig.json

@@ -8,7 +8,7 @@
 			"es6",
 			"es2017"
 		],
-		"target": "es2017",
+		"target": "esnext",
 		"module": "es6"
 	}
 }

package.json

@@ -4,35 +4,39 @@
 	"description": "Addons for FrankerFaceZ",
 	"private": true,
 	"scripts": {
-		"start": "cross-env SERVING=true rspack serve",
-		"start:prod": "cross-env SERVING=true NODE_ENV=production rspack serve",
-		"build": "rspack build && node bin/addon_hash",
+		"start": "cross-env NODE_ENV=development webpack serve",
+		"start:prod": "cross-env NODE_ENV=production webpack serve",
+		"build": "cross-env NODE_ENV=production webpack build && node bin/addon_hash",
+		"build:dev": "cross-env NODE_ENV=development webpack build && node bin/addon_hash",
 		"clean": "rimraf dist",
 		"eslint": "eslint \"src/**/*.{js,jsx,vue}\"",
 		"update-times": "node bin/update_times",
 		"prepare": "husky install"
 	},
 	"devDependencies": {
-		"@rspack/cli": "^0.3.0",
-		"@rspack/plugin-minify": "^0.3.0",
-		"browserslist": "^4.21.10",
+		"copy-webpack-plugin": "^11.0.0",
 		"cross-env": "^7.0.3",
 		"css-loader": "^6.8.1",
+		"esbuild-loader": "^4.0.2",
 		"eslint": "^8.48.0",
 		"eslint-plugin-import": "^2.28.1",
 		"eslint-plugin-react": "^7.33.2",
 		"eslint-plugin-vue": "^9.17.0",
 		"extract-loader": "^5.1.0",
 		"file-loader": "^6.2.0",
 		"husky": "^8.0.3",
+		"minify-graphql-loader": "^1.0.2",
 		"rimraf": "^5.0.1",
-		"rspack-manifest-plugin": "5.0.0-alpha0",
 		"sass": "^1.66.1",
 		"sass-loader": "^13.3.2",
 		"staged-git-files": "^1.3.0",
 		"string-replace-loader": "^3.1.0",
 		"vue-loader": "^15.10.2",
-		"vue-template-compiler": "^2.7.14"
+		"vue-template-compiler": "^2.7.14",
+		"webpack": "^5.88.2",
+		"webpack-cli": "^5.1.4",
+		"webpack-dev-server": "^4.15.1",
+		"webpack-manifest-plugin": "^5.0.0"
 	},
 	"dependencies": {
 		"@wizulus/code": "^1.0.2",