Push Notification Tester

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2.6 Migrated to Firebase (FCM). Latest libs, build-tools, sdk level 27. Source code now in Kotlin
2.5 Updated to latest libs, build-tools, sdk level
2.4 Added option for delivery and notification prioritization. Updated to latest GCM API on Server & Client
2.3 Increased delayed sending to 3600 seconds max
2.2 Fixed small window leak issue
2.1 Added native error dialog from Play Services lib (prompt for Update etc.)