bump pxt, enable github support

.gitignore

@@ -31,3 +31,4 @@ hexcache
 *.iml
 .vscode/.BROWSE.VC.DB-shm
 .vscode/.BROWSE.VC.DB-wal
+package-lock.json

calliope.code-workspace

@@ -0,0 +1,13 @@
+{
+	"folders": [
+		{
+			"path": "../pxt"
+		},
+		{
+			"path": "../pxt-common-packages"
+		},
+		{
+			"path": "."
+		}
+	]
+}

package.json

@@ -46,7 +46,7 @@
     "typescript": "2.6.1"
   },
   "dependencies": {
-    "pxt-common-packages": "6.16.24",
-    "pxt-core": "5.28.24"
+    "pxt-common-packages": "6.17.1",
+    "pxt-core": "5.30.28"
   }
 }

pxtarget.json

@@ -22,7 +22,10 @@
         "preferredPackages": [
             "Microsoft/pxt-neopixel"
         ],
-        "githubPackages": true
+        "githubPackages": true,
+        "cloudProviders": {
+            "github": {}
+        }
     },
     "compile": {
         "isNative": true,