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/core/control.ts

@@ -0,0 +1,48 @@
+/**
+* Runtime and event utilities.
+*/
+//% weight=1 color="#333333"
+namespace control {
+
+    /**
+     * Returns the value of a C++ runtime constant
+     */
+    //% weight=2 weight=19 blockId="control_event_source_id" block="%id" blockGap=8
+    //% shim=TD_ID
+    export function eventSourceId(id: EventBusSource): number {
+        return id;
+    }
+    /**
+     * Returns the value of a C++ runtime constant
+     */
+    //% weight=1 weight=19 blockId="control_event_value_id" block="%id"
+    //% shim=TD_ID
+    export function eventValueId(id: EventBusValue): number {
+        return id;
+    }
+
+    /**
+     * Display specified error code and stop the program.
+     */
+    //% shim=pxtrt::panic
+    export function panic(code: number) { }
+
+    /**
+     * If the condition is false, display msg on serial console, and panic with code 098.
+     */
+    export function assert(condition: boolean, msg ?: string) {
+        if (!condition) {
+            console.log("ASSERTION FAILED")
+            if (msg != null) {
+                console.log(msg)
+            }
+            panic(98)
+        }
+    }
+
+    /**
+     * Display warning in the simulator.
+     */
+    //% shim=pxtrt::runtimeWarning
+    export function runtimeWarning(message: string) { }
+}