gbdiscon: new app to disconnect from Gadgetbridge

gbdiscon sends an action intent that's picked up by Gadgetbridge to
disconnect the Bangle.js. It requires the Bluetooth intent API to be
enabled in Gadgetbridge. The clock face is loaded immediately.

apps/gbdiscon/ChangeLog

@@ -0,0 +1 @@
+0.01: New App!

apps/gbdiscon/app.js

@@ -0,0 +1,7 @@
+{
+Bangle.setUI({mode:"custom",remove:()=>{}});"Bangle.loadWidgets"; // Allow fastloading.
+
+Bluetooth.println(JSON.stringify({t:"intent", action:"nodomain.freeyourgadget.gadgetbridge.BLUETOOTH_DISCONNECT", extra:{EXTRA_DEVICE_ADDRESS:NRF.getAddress()}}));
+
+Bangle.showClock();
+}

apps/gbdiscon/metadata.json

@@ -0,0 +1,13 @@
+{ "id": "gbdiscon",
+  "name": "Disconnect from Gadgetbridge",
+  "shortName":"Disconnect",
+  "version":"0.01",
+  "description": "Disconnect from your android device by running this app. The app will forward you to your clock face immediately after triggering the command.",
+  "icon": "app.png",
+  "tags": "android, gadgetbridge, bluetooth, bt",
+  "supports" : ["BANGLEJS", "BANGLEJS2"],
+  "storage": [
+    {"name":"gbdiscon.app.js","url":"app.js"},
+    {"name":"gbdiscon.img","url":"app-icon.js","evaluate":true}
+  ]
+}