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/devices/pxt.json

@@ -1,6 +1,10 @@
 {
     "name": "devices",
     "description": "BETA -  Camera, remote control and other Bluetooth services. App required.",
+    "dependencies": {
+        "core": "file:../core",
+        "bluetooth": "file:../bluetooth"
+    },
     "files": [
         "README.md",
         "enums.d.ts",
@@ -8,12 +12,8 @@
         "devices.cpp",
         "devices.ts"
     ],
+    "public": true,
     "icon": "./static/packages/devices/icon.png",
     "hidden": true,
-    "public": true,
-    "dependencies": {
-        "core": "file:../core",
-        "bluetooth": "file:../bluetooth"
-    },
     "installedVersion": "ljipgq"
-}
+}