Fixes #1584 Implemented auto toggle when network state changes.

[danishjamal104]

Fixes #1584

Changes

1. Implemented NetworkChangeReceiver broadcast receiver.
2. Registered the receiver in DashboardActivity.
3. Override onNewIntent method to toggle the app state from offline to online and vice versa.
4. Displays toast whenever auto switch takes place.

Screenshot

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[danishjamal104]

@robustTechie pleases review the changes. Thanks :)

[Aditya-gupta99]

We are closing this PR as it causes a branch conflict since the Java file has now been migrated to kotlin