V4 updates (#210)

* update pxt.json files

* Fix button event enums

fixes https://github.com/microsoft/pxt-calliope/issues/206

* Fix Safari CSS Rule for iOS app

fixes https://github.com/microsoft/pxt-calliope/issues/205

* aprove preffered repos

should fix https://github.com/microsoft/pxt-calliope/issues/167

libs/radio/pxt.json

@@ -1,4 +1,18 @@
 {
+    "name": "radio",
+    "description": "The radio services",
+    "dependencies": {
+        "core": "file:../core"
+    },
+    "files": [
+        "README.md",
+        "shims.d.ts",
+        "enums.d.ts",
+        "radio.cpp",
+        "radio.ts",
+        "targetoverrides.ts"
+    ],
+    "public": true,
     "additionalFilePath": "../../node_modules/pxt-common-packages/libs/radio",
     "icon": "./static/packages/radio/icon.png",
     "yotta": {
@@ -10,4 +24,4 @@
             }
         }
     }
-}
+}