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

theme/style.less

@@ -82,6 +82,12 @@
         }
     }
 }
+// Safari Only for iPad and iPhone second rule
+@supports (-webkit-touch-callout: none) {
+    #mainmenu .right.menu {
+        margin-right: 4rem;
+    }
+}
 
 /* Mobile */
 @media only screen and (max-width: @largestMobileScreen) {