add block to stop program (#943)

* add block to stop program

* renaming

libs/ev3/brick.ts

@@ -0,0 +1,13 @@
+namespace brick {
+    /**
+     * Exits the program to the main menu. (in the simulator restarts it)
+     */
+    //% blockId=loopstop block="exit program"
+    //% help=reference/brick/exit-program
+    //% weight=10
+    //% blockGap=8
+    //% group="Buttons"
+    export function exitProgram() {
+        control.reset();
+    }
+}