Added extensions (#385)

* inject file importers as extensions

* logging

* updated signature

editor/extension.ts

@@ -0,0 +1,28 @@
+/// <reference path="../node_modules/pxt-core/built/pxteditor.d.ts" />
+
+namespace pxt.editor {
+    initExtensionsAsync = function(opts: pxt.editor.ExtensionOptions): Promise<pxt.editor.ExtensionResult> {
+        pxt.debug('loading microbit target extensions...')
+        const res: pxt.editor.ExtensionResult = {
+            hexFileImporters: [{
+                id: "blockly",
+                canImport: data => data.meta.cloudId == "microbit.co.uk" && data.meta.editor == "blockly",
+                importAsync: (project, data) => project.createProjectAsync({
+                    filesOverride: {
+                        "main.blocks": data.source
+                    }, name: data.meta.name
+                })
+            }, {
+                    id: "td",
+                    canImport: data => data.meta.cloudId == "microbit.co.uk" && data.meta.editor == "touchdevelop",
+                    importAsync: (project, data) =>
+                        project.createProjectAsync({
+                            filesOverride: { "main.blocks": "", "main.ts": "  " },
+                            name: data.meta.name
+                        }).then(() => project.convertTouchDevelopToTypeScriptAsync(data.source))
+                        .then(text => this.textEditor.overrideFile(text))
+                }]
+        };
+        return Promise.resolve<pxt.editor.ExtensionResult>(res);
+    }
+}

editor/tsconfig.json

@@ -0,0 +1,12 @@
+{
+    "compilerOptions": {
+        "target": "es5",
+        "noImplicitAny": true,
+        "noImplicitReturns": true,
+        "declaration": true,
+        "out": "../built/editor.js",
+        "rootDir": ".",
+        "newLine": "LF",
+        "sourceMap": false
+    }
+}

pxtarget.json

@@ -228,33 +228,7 @@
         "feedbackUrl": "https://www.research.net/r/MCmicro",
         "appStoreID": "1092687276",
         "mobileSafariDownloadProtocol": "microbithex://?data",
-        "browserSupport": [
+        "extendEditor": true,
-            {
-                "name": "unsupported",
-                "os": "*",
-                "path": "/browsers"
-            },
-            {
-                "name": "unsupported",
-                "os": "mac",
-                "path": "/browsers/mac"
-            },
-            {
-                "name": "unsupported",
-                "os": "linux",
-                "path": "browsers/linux"
-            },
-            {
-                "name": "unsupported",
-                "os": "rpi",
-                "path": "/raspberry-pi"
-            },
-            {
-                "name": "unsupported",
-                "os": "windows",
-                "path": "/browsers/windows"
-            }
-        ],
         "docMenu": [
             {
                 "name": "Support",