Rewrite status persistency with Parcels

[pilhuhn]

Serialization on Android is slow and for persistence of Tweets, Zwitscher is serializing them by writing them to a ByteArrayOutputStream and persisting the result afterwards.

Parcels require more work, but are faster as they need no reflection unlike serialization.

[pilhuhn]

Actually that is not even true. Statuses are persisted as JSON string.
The serialization only happens when queueing.

It may make sense though to split a status into fields that are put into individual database columns and
to split out User objects and also RetweetedStatuses and (URL/Media)Entities