Add partial implementation of adding library sources via editor

This adds lots of commented out code that provides a settings panel
to add new library sources. It is incomplete as it doesn't actually
add/update the library sources on the runtime.

For 1.3, I'm focussing on allowing additional sources get added
via the settings file only. I've done enough work on the editor
side to convince myself more work is needed than I can justify
at this time on what is otherwise not going to be a widely
used feature.

packages/node_modules/@node-red/runtime/lib/library/index.js

@@ -18,6 +18,7 @@
 const {events} = require("@node-red/util")
 const knownTypes = {};
 const libraries = {};
+const libraryConfigs = {};
 const libraryPlugins = {};
 
 // Libraries defined in the settings file. Their configurations
@@ -37,7 +38,9 @@ function init(runtime) {
             runtimeLibraries.forEach(library => {
                 if (library.type === id) {
                     library.local = false;
+                    libraryConfigs[library.id] = library;
                     libraries[library.id] = new plugin.class(library)
+                    libraryConfigs[library.id].type = id;
                     if (libraries[library.id].init) {
                         libraries[library.id].init();
                     }
@@ -49,11 +52,13 @@ function init(runtime) {
     })
 
     knownTypes.flows = 'node-red';
+    libraries["local"] = require("./local");
+    libraries["local"].init(runtime);
+    libraryConfigs["local"] = libraries["local"]
 
     libraries["examples"] = require("./examples");
     libraries["examples"].init(runtime);
-    libraries["local"] = require("./local");
-    libraries["local"].init(runtime);
+    libraryConfigs["examples"] = libraries["examples"]
 
     try {
         runtimeLibraries = runtime.settings.editorTheme.library.sources;
@@ -100,42 +105,58 @@ function saveEntry(library,type,path,meta,body) {
 }
 
 function getLibraries() {
-    const libraryList = [
-        {
-            id: "local",
-            label: "editor:library.types.local",
-            user: false,
-            icon: "fa fa-bath"
-        },
-        {
-            id: "examples",
-            label: "editor:library.types.examples",
-            user: false,
-            readOnly: true,
-            types: ['flows']
-        }
-    ];
-
+    const libraryList = []
     for (let id in libraries) {
         if (libraries.hasOwnProperty(id)) {
-            if (id !== 'local' && id !== 'examples') {
-                libraryList.push({
-                    id: id,
-                    label: libraries[id].name || id,
-                    user: false,
-                    icon: libraries[id].icon
-                })
+            var config = getConfig(id);
+            // Don't include the full configuration of each library when providing
+            // the list of all libraries
+            delete config.config;
+            libraryList.push(config);
+        }
+    }
+    return libraryList;
+}
+
+function getConfig(id) {
+    var lib = {
+        id: id,
+        label: libraryConfigs[id].label || id,
+        user: false,
+        icon: libraryConfigs[id].icon
+    }
+    if (libraryConfigs[id].types) {
+        lib.types = libraryConfigs[id].types
+    }
+    if (libraryConfigs[id].readOnly) {
+        lib.readOnly = libraryConfigs[id].readOnly
+    }
+
+    if (libraryConfigs[id].type) {
+        lib.type = libraryConfigs[id].type;
+
+        var def = libraryPlugins[lib.type];
+        if (def && def.defaults) {
+            lib.config = {};
+            for (var d in def.defaults) {
+                if (def.defaults.hasOwnProperty(d)) {
+                    if (def.defaults[d].type !== 'password') {
+                        lib.config[d] = libraryConfigs[id][d];
+                    } else if (!!libraryConfigs[id][d]) {
+                        lib.config["has_"+d] = true;
+                    }
+                }
             }
         }
     }
-
-    return libraryList;
+    return lib;
 
 }
 
 module.exports = {
     init: init,
     getLibraries: getLibraries,
+    // getConfig: getConfig,
     register: registerType,
     getEntry: getEntry,
     saveEntry: saveEntry