Fix disconnect again, and expose globals in window.wsc object (#16)

Pretty simple fix

fixes #14

Co-authored-by: Drew Bednar <drew@androiddrew.com>
Reviewed-on: #16

src/eventListeners.js

@@ -34,6 +34,7 @@ export function setupEventListeners() {
         } else {
             console.log("Disconnecting from port...")
             globals.setPortConnected(false);
+            globals.reader.cancel();
             onPortDisconnect();
         }
     });

src/globals.js

@@ -64,8 +64,10 @@ export function setWriter(newWriter) {
 // expose some globals for debuggin in webconsole
 if (typeof window !== 'undefined') {
     window.wsc = {
-        isPortConnected,
+        get isPortConnected() { return isPortConnected; },
-        autoscroll,
+        get autoscroll() { return autoscroll; },
-        serialPorts,
+        get serialPorts() { return serialPorts; },
+        get reader() { return reader; },
+        get writer() { return writer; }
     };
 }