Android

• added experimental feature for broadcasting media or microphone to snapserver (#7 and #33)
• updated snapclient libs to 0.25.0

The broadcasting feature has 2 major caveats to be aware of:

• it may crash if another application is already broadcasting (if you've got Snap.Net running on your PC with broadcasting enabled, disable it!)
• some applications such as Spotify explicitly disallow recording by third party apps, which means audio from apps like that can not be broadcast at all:
  https://developer.android.com/guide/topics/media/av-capture
  https://developer.android.com/reference/android/media/AudioAttributes#ALLOW_CAPTURE_BY_NONE