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/bluetooth/bluetooth.cpp

@@ -1,6 +1,7 @@
 #include "pxt.h"
 #include "MESEvents.h"
 #include "MicroBitUARTService.h"
+#include "BLEHF2Service.h"
 
 using namespace pxt;
 
@@ -10,6 +11,14 @@ using namespace pxt;
 //% color=#0082FB weight=96 icon="\uf294"
 namespace bluetooth {
     MicroBitUARTService *uart = NULL;
+    BLEHF2Service* pHF2 = NULL;
+
+    //%
+    void __log(String msg) {
+        if (NULL == pHF2)
+            pHF2 = new BLEHF2Service(*uBit.ble);
+        pHF2->sendSerial(msg->data, msg->length, false);
+    }
 
     /**
     *  Starts the Bluetooth accelerometer service