Initial plugin runtime api implementation

test/resources/plugin/test-plugin/locales/en-US/test-editor-plugin.json

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+{
+    "plugin": "winning"
+}

test/resources/plugin/test-plugin/package.json

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+{
+  "name": "test-plugin",
+  "version": "1.0.0",
+  "description": "",
+  "node-red": {
+      "plugins": {
+          "test": "test.js",
+          "test-editor-plugin": "test-editor-plugin.html",
+          "test-runtime-plugin": "test-runtime-plugin.js"
+      }
+  }
+}

test/resources/plugin/test-plugin/test-editor-plugin.html

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+<script type="text/javascript">
+    console.log("Loaded test-plugin/test-editor-plugin")
+    // RED.plugins.registerPlugin("")
+    //
+</script>

test/resources/plugin/test-plugin/test-runtime-plugin.js

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+module.exports = function(RED) {
+    console.log("Loaded test-plugin/test-runtime-plugin")
+
+    RED.plugins.registerPlugin("my-test-runtime-only-plugin", {
+        type: "bar",
+        onadd: function() {
+            console.log("my-test-runtime-only-plugin.onadd called")
+        }
+    })
+}

test/resources/plugin/test-plugin/test.html

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+<script type="text/javascript">
+    console.log("Loaded test-plugin/test")
+    // RED.plugins.registerPlugin("")
+</script>

test/resources/plugin/test-plugin/test.js

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+module.exports = function(RED) {
+    console.log("Loaded test-plugin/test")
+
+    RED.plugins.registerPlugin("my-test-plugin", {
+        type: "foo",
+        onadd: function() {
+            console.log("my-test-plugin.onadd called")
+            RED.events.on("registry:plugin-added", function(id) {
+                console.log(`my-test-plugin: plugin-added event "${id}"`)
+            });
+        }
+    })
+}