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.

Fixes b/15140940

Change-Id: I32ae3d24a9491baf96048040b5ac78f6f731e468
NO_SQ: multi-project submit