Changes

Unit Tests: Add listening to NEWTDemoListener* (Missed in prev. patch)

Bug 1211: Fix regression of GLMediaPlayerImpl caused by commit
68c8e39fa8d6e700f0a99241c1a01a435b7f6284
GLMediaPlayerImpl.updateAttributes(..):
 - always set state -> Initialized if it was Uninitialized,
   regardless whether we start StreamWorker.
  - No need to handle exceptions here, just throw/pass/propagate them,
   since called catches them and deals w/ 'em.

FFMPEGDynamicLibraryBundleInfo.initSymbols(): Just return null instead
of throwing an exception, it is OK not to have ffmpeg/libav

Unit Tests: NEWTDemoListener: Less verbose; GraphUI-Demos: Show DPI and
Pixel-Scale in GLEventListener.init(...)