Console to dmesg (#910)

* always pip console.log to dmesg

* trim new line

* restore storage

* restore new line

* remove unused variable

libs/ev3/startup.ts

@@ -1,5 +1,7 @@
 // This is the last thing executed before user code
-
+console.addListener(function(msg: string) {
+    control.dmesg(msg.substr(0, msg.length - 1))
+})
 // pulse green, play startup sound, turn off light
 brick.setStatusLight(StatusLight.GreenPulse);
 // We pause for 100ms to give time to read sensor values, so they work in on_start block