refactor[core]: use webpack-dev-server now (#355)

* bump deps: update vue-splitpane version

* refactor[chore]: use webpack-dev-serve build

* perf:settings

* doc: uodate readme

src/views/example/table/complexTable.vue

@@ -331,7 +331,7 @@ export default {
     },
     handleDownload() {
       require.ensure([], () => {
-        const { export_json_to_excel } = require('vendor/Export2Excel')
+        const { export_json_to_excel } = require('@/vendor/Export2Excel')
         const tHeader = ['时间', '地区', '类型', '标题', '重要性']
         const filterVal = ['timestamp', 'province', 'type', 'title', 'importance']
         const data = this.formatJson(filterVal, this.list)