Merge "Address API review comments. 1. Moved le stuff to it's subpackage....

Merge "Address API review comments. 1. Moved le stuff to it's subpackage. Remove BluetoothLe for all classes except *Scanner, *ScanSetting, *Advertiser and *AdvertiseSettings. 2. Make all callbacks abstract classes instead of interfaces. 3. Moved AdvertisementData and ScanRecord out and removed AdvertiseBaseData 4. Removed newBuild and use new Builder for all builders. 5. Using setxxx in builders. 6. Misc other changes." into lmp-preview-dev