rename "microbit" package to "core" #414 (#270)

* rename "microbit" package to "core" #414

* shouldn't edit the package id.

* updating package.json

* updated the wrong version

* missed updating pxt.json of tests

libs/bluetooth/bluetooth.ts

@@ -0,0 +1,43 @@
+namespace bluetooth {
+    /**
+     * Returns the delimiter corresponding string
+     */
+    //% blockId="bluetooth_uart_delimiter_conv" block="%del"
+    //% weight=1 parts="bluetooth"
+    export function delimiters(del: Delimiters): string {
+        // even though it might not look like, this is more
+        // (memory) efficient than the C++ implementation, because the
+        // strings are statically allocated and take no RAM 
+        switch (del) {
+            case Delimiters.NewLine: return "\n"
+            case Delimiters.Comma: return ","
+            case Delimiters.Dollar: return "$"
+            case Delimiters.Colon: return ":"
+            case Delimiters.Fullstop: return "."
+            case Delimiters.Hash: return "#"
+            default: return "\n"
+        }
+    }
+
+    /**
+    *  Writes to the Bluetooth UART service buffer. From there the data is transmitted over Bluetooth to a connected device.
+    */
+    //% help=bluetooth/uart-write
+    //% blockId=bluetooth_uart_write block="bluetooth uart write %data" blockGap=8
+    //% parts="bluetooth" shim=bluetooth::uartWrite
+    export function uartWrite(data: string): void {
+        // dummy implementation for simulator
+        console.log("UART Write: " + data)
+    }
+
+    /**
+     *  Reads from the Bluetooth UART service buffer, returning its contents when the specified delimiter character is encountered.
+     */
+    //% help=bluetooth/uart-read
+    //% blockId=bluetooth_uart_read block="bluetooth uart read %del=bluetooth_uart_delimiter_conv" blockGap=8
+    //% parts="bluetooth" shim=bluetooth::uartRead
+    export function uartRead(del: string): string {
+        // dummy implementation for simulator
+        return "???"
+    }
+}