BLE improvements

[arsab]

Code Inspection fixes:

• Discovering new device means we could find New valid device/service (couple validity check with search) so changes to ServiceInterface, BleSensorSDK18, CscService, HeartRateService, BatteryService.

• When we buffer messages send to sensor, try to keep order: use FIFO rather than LIFO so changes to Executer

Ease operation:

• Try to reconnect while riding with click or on disconnect (get far and comme back...) so changes to CockpitActivity, CockpitView, SensorService , AppBroadcaster, Connector

Improve new sensor discovery:

• Make selective scan to reduce sensor list to sort: so changes to BleScannerSDK21
• speed up new service association during scann: so changes to BleSensorsSDK18, SensorItemState

This improve significantly BLE discovery and keep connection, it would be worth in future to decouple "configuration" vs run time states

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In relation with challanges highlighted in issues: https://github.com/bailuk/AAT/issues/78 https://github.com/bailuk/AAT/issues/61

few improvements, few discovery and association challenges remains, decouple configuration states and run time states. e.g. do we need to space messages?

sorry for confusion it is simply change: https://github.com/bailuk/AAT/pull/80/commits/b087bdd93c29702815051736c927bbd310512d6a

[bailuk]

Thank you for this contribution. I merge this into a separate branch for testing. It will go into master as soon (hopefully after this weekend).