API change request: have a time return value for setLastTime

Following #354 (closed), we removed all the processing done in the Android app regarding the media time update. See vlc-android@0a84d7f0

Issue: When saving a media time using IMedia::setLastTime, there is no way to get the new (medialibrary processed) time without re-querying this media just after that. Even if it works, it's far from being optimized.

Request: Get a new IMedia::setAndGetLastTime returning the actual value saved in the DB. This way we can locally store the new time without having to do a new query to the ML.

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