Support process.env in vue.config.js & devServer.before improved

• first require('vue.config.js') for pluginOptions.vite and then loadEnv by vite-plugin-env-compatible to process.env
• vite-plugin-vue-cli require('vue.config.js') again for full vue.config.js UserConfig
• add app.all method, better devServer.before support
• generate entry html file by public/index.html support(also use lodash.template to compile)
• Thanks xmasong for help