Endprogram (#884)

* moving end program logic to c++

* typo

* always stop on reset

libs/core/buttons.ts

@@ -162,7 +162,6 @@ namespace brick {
         // this needs to be done in query(), which is run without the main JS execution mutex
         // otherwise, while(true){} will lock the device
         if (ret & DAL.BUTTON_ID_ESCAPE) {
-            motors.stopAll(); // ensuring that all motors are off
             control.reset()
         }
         return ret