avr: use calloc to avoid set 0 and no warning
player: playlist ui
player: add help.html
player: config dir
player: fix error decoders from config. FFmpeg is 1st.
fix build error: codec id, pixfmt
always renderer if a packet has key frame
better statistic struct. real fps compute
correct fps computation after seek
statistics private data explictly shared
player: stop playing if main window closed
fix video-no-audio seek error etc
fix video too fast if too many invalid video packets
player: fix qt4 build
const members
version 1.3.0

Changelog:
- Selectable audio track
- Multiple rendering target for 1 video support
- Hardware decoding support(unstable): DXVA2 for windows, VA-API for
x11(bad performance now)
- Region of Interest(ROI) support, i.e. crop.
- Filter support(Experimental)
- Video eq: brightness, contrast, saturation
- Repeat support
- Mang api changes
- QML: compatible with many QtMultiMedia APIs
- build/install: check arch, fix wrong rpath and launch error on Mac,
add installer
- player: playlist, history, better online tv, etc.
Merge remote-tracking branch 'upstream/master'
Added cedarx decoder.
Panels changed to transparent.
hwa: fix crash after seeking

TODO:
why queue are not empty?
how to skip decoding without fps decrease to much