BLE HF2 log service (#1549)

* basic hf2 service

* service to send hf2 log messages

* use common console.log

* updated shims

* adding config

* adding simulator

* fix hf2 logging

* hide console blocks

libs/core/pxt.json

@@ -29,6 +29,7 @@
         "gestures.jres",
         "control.ts",
         "control.cpp",
+        "console.ts",
         "game.ts",
         "led.cpp",
         "led.ts",