Refactor Bluetooth

[jverbraeken]

• Relevant Issues: -

• Related Pull Requests: #105

• • *

What

This Pull Request adds to the repository a full refractoring of the Bluetooth related classes.

• The EventBus is used extensively to communicate
• A background service is introduced
• A global Application class is introduced to keep track of the background service
• Every data type can now be sent over Bluetooth (so not just contacts)
• The large Bluetooth classes is split in 5 new classes (and also for a part in APairingHandler)

Why

This Pull Request is needed because the old Bluetooth class was difficult to understand, the Bluetooth screen had to be opened to receive contacts and only contacts could be sent and PMD didn't like the coupling / class size

How

This feature can be viewed/tested within the project by sharing contacts over Bluetooth

Alternative implementation

Other implementations that I've have considered are -

Notes

The very first meeting I'll give you a walkthrough through this new code ;-)

[jverbraeken]

@ericcornelissen @KilianCallebaut @clenrock Implemented all your suggestions! Great to get so much feedback :P