Deprecate unused and implementation-specific parts of TTS API

Second changeset, first one was committed too hastily.

TTS Voice-data related API was originally written with
one engine in mind (pico sVox TTS). It exposes implementation
details that should be private to the engine implementation.

- Deprecating fields of ACTION_CHECK_TTS_DATA results that were
used by sVox language packs to find out location of voice data.
Those fields are TTS engine implementation details and should be
private:
EXTRA_VOICE_DATA_ROOT_DIRECTORY
EXTRA_VOICE_DATA_FILES
EXTRA_VOICE_DATA_FILES_INFO
- Deprecating fields of ACTION_CHECK_TTS_DATA request that are
providing unnescesary functionality (it can be easily done on client
side):
EXTRA_CHECK_VOICE_DATA_FOR
- Deprecating some of the return codes of ACTION_CHECK_TTS_DATA - they
are specific to sVox pico voice data and in all cases can be replaced
by CHECK_VOICE_DATA_FAIL result code.
CHECK_VOICE_DATA_BAD_DATA
CHECK_VOICE_DATA_MISSING_DATA
CHECK_VOICE_DATA_MISSING_VOLUME
- Changing semantics of ACTION_TTS_DATA_INSTALLED intent. It's now
more generic and covers any change of available voice data set (so, not only
adding languages, but also removing them should trigger broadcast. Adding and
removing features to existing locale (like embedded synthesis) should be marked
by broadcast as well).
- Deprecating its EXTRA_TTS_DATA_INSTALLED result field - client should discover
the change by running ACTION_CHECK_TTS_DATA intent.
- Making GetSampleText intent public again - it's used by most TTS engines to
provide unique demonstation data.
- Deprecating TextToSpeech.OnUtteranceCompletedListener - it was replaced
by UtteranceProgressListener in API level 15, but no one put deprecation tag
on it.

Change-Id: Ia58af7f218dc1568570712f435782d2003260e82