Add initial palette sidebar

Gruntfile.js

@@ -119,6 +119,7 @@ module.exports = function(grunt) {
                     "editor/js/ui/palette.js",
                     "editor/js/ui/tab-info.js",
                     "editor/js/ui/tab-config.js",
+                    "editor/js/ui/tab-palette.js",
                     "editor/js/ui/editor.js",
                     "editor/js/ui/tray.js",
                     "editor/js/ui/clipboard.js",

editor/js/ui/sidebar.js

@@ -206,6 +206,7 @@ RED.sidebar = (function() {
         showSidebar();
         RED.sidebar.info.init();
         RED.sidebar.config.init();
+        RED.sidebar.palette.init();
         // hide info bar at start if screen rather narrow...
         if ($(window).width() < 600) { toggleSidebar(); }
     }

red/api/locales/en-US/editor.json

@@ -225,6 +225,10 @@
             "filterUnused":"unused",
             "filterAll":"all",
             "filtered": "__count__ hidden"
+        },
+        "palette": {
+            "name": "Palette management",
+            "label": "palette"
         }
     },
     "typedInput": {