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/console.ts

@@ -0,0 +1,53 @@
+/// <reference no-default-lib="true"/>
+
+/**
+ * Reading and writing data to the console output.
+ */
+//% weight=12 color=#002050 icon="\uf120"
+//% advanced=true
+namespace console {
+    type Listener = (text: string) => void;
+
+    //% whenUsed
+    let listeners: Listener[] = undefined;
+
+    /**
+     * Write a line of text to the console output.
+     * @param value to send
+     */
+    //% weight=90
+    //% help=console/log blockGap=8
+    //% text.shadowOptions.toString=true
+    export function log(text: string): void {
+        // pad text on the 32byte boundar
+        text += "\r\n";
+        control.__log(text);
+        // send to listeners
+        if (listeners)
+            for (let i = 0; i < listeners.length; ++i)
+                listeners[i](text);
+    }
+
+    /**
+     * Write a name:value pair as a line of text to the console output.
+     * @param name name of the value stream, eg: "x"
+     * @param value to write
+     */
+    //% weight=88 blockGap=8
+    //% help=console/log-value
+    export function logValue(name: string, value: number): void {
+        log(name ? `${name}: ${value}` : `${value}`)
+    }
+
+    /**
+     * Adds a listener for the log messages
+     * @param listener
+     */
+    //%
+    export function addListener(listener: (text: string) => void) {
+        if (!listener) return;
+        if (!listener)
+            listeners = [];
+        listeners.push(listener);
+    }
+}