qmlplayer: add 'file:' if local file is set in command line

otherwise file will be "qrc:path"
qml: add MediaPlayer.Status
properties must be applied even if set when player is not started

TODO: add applyXXX for those properties
store dts, position and AVPacket* in Packet
fix playback stopped at a wrong time and wrong repeat
add missing avpacket functions for old ffmpeg/libav
input classes
Packt is implicitly shared to reduce AVPacket copy
decoders use Packet as parameter
init statistics when decoders are ready. regression since async load
Merge branch 'dec'
dynamic load libass. (use capi project)
Merge branch 'dyld_ass'
libav build error (const AVPacket* parameter)
fix wrong local path on win
vaapi: fix wrong frame size. blurry line at bottom. issue 328
example: fix command line encoding (win)

see qApp.arguments()
virtual dtors
StalledMedia status if demuxer is interrupt
speed up seeking