GLMediaPlayer Multithreaded Decoding: GLMediaPlayer* (Part-5) - WIP

- Update/fix GLMediaPlayer API doc

- GLMediaEventListener: Add event bits for all state changes to be delivered via attributesChanged(..)

- StreamWorker / Decoder Thread:
  - Use StreamWorker only !
  - Handle exceptions on StreamWorker via StreamException
  - Handles stream initialization and decoding (-> initStream(..))

- Split initGLStream(..) -> initStream(..) + initGL(GL)
  - allow initStream(..)'s implementation being executed on StreamWorker
  - allow GL initialization to be 'postponed' when stream is read,
    i.e. non blocking stream initialization (UI .. etc)

- Handle EOS via END_OF_STREAM_PTS -> pause/event

- Video: Use lock-free LFRingbuffer, similar to
  ALAudioSink (commit f18a94b3defef16e98badd6d99f2422609aa56c5)

+++

- FFMPEGDynamicLibraryBundleInfo
 - Add avcodec's:
     - avcodec_get_frame_defaults, avcodec_free_frame (54.28.0), avcodec_flush_buffers,
 - Add avutil's:
     - av_frame_unref (55.0.0)
 - Add avformat's:
     - avformat_seek_file (??)

+++

- FFMPEGMediaPlayer Native:
  - add 'snoop' video frames for a/v frame count relation.
    disabled per default, since no more needed due to ALAudioSink's
    grow-buffer usage of LFRingbuffer.

  - use sp_avcodec_free_frame if available

  - 'useRefCountedFrames=1' for libav 55.0 to cache more than one audio frame,
     not used since ALAudioSink's OpenAL usage does not require it (copies data once).
     Note: the above snooped-video frame count is used here.

  - use only one cached audio-frame (-> see above, OpenAL copies data once),
    while reusing the NIO buffer!

  - Perform OpenGL sync (glFinish) in native code!

  - find proper PTS value, i.e. either frame's PTS or DTS,
    see 'PTSStats'.

- FFMPEGMediaPlayer Java:
  - use private fields

  - simplified code due to above changes.

+++

Working Tests: MovieSimple and MovieCube

TODO-1: Fix
  - Android
  - OMXGLMediaPlayer

TODO-2:
  - Fix issue where async audio frames arrive much later than 1st video frame, i.e. around 300ms.
  - Default TextureCount .. maybe 3 ?
  - Adding Audio synchronization ?
  - Find 'truth' about correlation of audio and video PTS values,
    currently, we assume both to be unrelated ?

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