NarrationPopup visual tweaks
add vumeter to narrationpopup
ClipCardsPlayer bugfixes

Stop relying on MediaPlayer#onPreparedListener which before had to
include logic to deal with every possible state. Instead use prepare()
and explicitly call whatever onPrepared actions are desired
NarrationPopup VU Meter improvements

Center meter, and hide it when not recording narration.
Merge branch 'master' of https://github.com/scalio/liger-prototype into dec16