Example apps improvements

[AlexBenny]

Moving here an old tracker issue ticket

The demo app as it stands is very basic in that it is only able to send a flat collection of events with little in the way of user interaction. It would be useful from a testing perspective to:

• Allow the user to change all the currently available settings for the various parts of the tracker
  • Gives us a visual representation of the API and its capabilities
• Define and send custom events in the demo app
  • Custom SelfDescribing Jsons
  • Custom input into our predefined events
• Publish the app to the play store so we have better vision on:
  • Required proguard settings for integrating the Tracker into other apps
  • Much easier for users to download and test the SDK before moving towards integration
  • Much better example of how to use the SDK in an actual application

This would allow us to have a fully defined demo of the SDK which lets users see the full event stream from the Tracker including our new automated events.