Rework Subflow Instance property UI (#2236)

* Add support of Subflow UI definition

* new UI definition for env var

* fix label

* fixed value obtaining

* fixed label width

* fix checkbox

* fix subflow info

* remove old subflow ui tests

* add tests

* merge ui new changes

* fix initial open button

* fix environment variable edit tab

* WIP: cp-1

* Rework subflow ui property

* Restrict SF value type according to input selection

* Move subflow property UI code to subflow.js

* Update subflow ui type select appearance

* Present subflow instance properties as table rather than generated UI

* Move subflow instance properties to separate tab

* Fix subflow property ui element layout issues

packages/node_modules/@node-red/editor-client/locales/en-US/editor.json

@@ -321,6 +321,31 @@
         "description": "Description",
         "show": "Show",
         "hide": "Hide",
+        "locale": "Select UI Language",
+        "icon": "Icon",
+        "inputType": "Input type",
+        "previewUI": "Preview UI",
+        "previewOK": "Preview OK",
+        "types": {
+            "str": "string",
+            "num": "number",
+            "bool": "bool",
+            "json": "json",
+            "bin": "buffer",
+            "env": "env var",
+            "no-value": "no value"
+        },
+        "menu": {
+            "input": "input",
+            "select": "select",
+            "checkbox": "checkbox",
+            "spinner": "spinner",
+            "hidden": "label only"
+        },
+        "spinner": {
+            "min": "min",
+            "max": "max"
+        },
         "errors": {
             "scopeChange": "Changing the scope will make it unavailable to nodes in other flows that use it",
             "invalidProperties": "Invalid properties:"
@@ -939,9 +964,11 @@
     },
     "editor-tab": {
         "properties": "Properties",
+        "envProperties": "Environment Variables",
         "description": "Description",
         "appearance": "Appearance",
-        "env": "Environment Variables"
+        "preview": "UI Preview",
+        "defaultValue": "Default value"
     },
     "languages" : {
         "de": "German",