Variable query editor (#856)

* refactor: convert module to typescript

* refactor: covert utils to typescript

* variable query editor WIP

* variable editor: fix type error after grafana/ui update

* variable editor: use FormLabel from grafana/ui

* variable editor: refactor

* variable editor: input validation and highlights

* variable editor: fix tests

* variable query: fix backward compatibility with empty queries

* fix linter errors

* variable editor: fix variable replacement in queries

webpack/webpack.base.conf.js

@@ -17,7 +17,7 @@ module.exports = {
   entry: {
     './module': './module.js',
     'components/config': './components/config.js',
-    'datasource-zabbix/module': './datasource-zabbix/module.js',
+    'datasource-zabbix/module': './datasource-zabbix/module.ts',
     'panel-triggers/module': './panel-triggers/module.js',
   },
   output: {
@@ -27,7 +27,7 @@ module.exports = {
   },
   externals: [
     // remove the line below if you don't want to use builtin versions
-    'jquery', 'lodash', 'moment', 'angular',
+    'jquery', 'lodash', 'moment', 'angular', 'emotion',
     'react', 'react-dom', '@grafana/ui', '@grafana/data',
     function (context, request, callback) {
       var prefix = 'grafana/';