Uartevent (#393)

* support for uart data event

* updated shims

sim/state/misc.ts

@@ -175,6 +175,10 @@ namespace pxsim.bluetooth {
     export function uartReadUntil(del: string): string {
         return serial.readUntil(del);
     }
+    export function onDataReceived(delimiters: string, handler: RefAction) {
+        let b = board();
+        b.bus.listen(DAL.MICROBIT_ID_BLE_UART, DAL.MICROBIT_UART_S_EVT_DELIM_MATCH, handler);
+    }
     export function onBluetoothConnected(a: RefAction) {
         // TODO
     }