add global environment variable feature

packages/node_modules/@node-red/nodes/core/common/91-global-config.html

@@ -0,0 +1,19 @@
+
+<script type="text/html" data-template-name="global-config">
+    <div cllass="form-tips">
+        <span data-i18n="[html]global-config.tip"></span>
+    </div>
+</script>
+
+<script type="text/javascript">
+    RED.nodes.registerType('global-config',{
+        category: 'config',
+        defaults: {
+            name: { value: "" },
+            env: { value: [] },
+        },
+        credentials: {
+            map: { type: "map" }
+        }
+    });
+</script>

packages/node_modules/@node-red/nodes/core/common/91-global-config.js

@@ -0,0 +1,7 @@
+module.exports = function(RED) {
+    "use strict";
+    function GlobalConfigNode(n) {
+        RED.nodes.createNode(this,n);
+    }
+    RED.nodes.registerType("global-config", GlobalConfigNode);
+}