try to use swresample/avresample

convert part is not finished
Merge branch 'master' into swr

Conflicts:
	src/QtAV/QtAV_Global.h
	src/libQtAV.pro
version 1.2.1

Changelog:
- Configurable video quality
- Correct aspect ratio. Any value is supported
- Fix some media playing problem
- Fix crash if no audio
- Fix d2d crash by setting multi-thread type
- Fix WidgetRenderer can not update problem
- Fix mem leak if renderer changed
- player: volume control, display correct online tv name, correct
display time
support mms: and file://
sdk header
Merge branch 'dev' into swr

Conflicts:
	src/QtAV/QtAV_Global.h
	src/libQtAV.pro
ffmpeg swresampler works(ref ffplay). but the speed is too fast

TODO:
mplayer2, avresample
correct spell of prepare
build with ffmpeg 0.9(swr 0.5) support

TODO:
how to resolve runtime version
swr_get_delay
workaround for get sample buffer size

TODO:
why crash for swr 0.5?
config test for swresample
no swr support
add missing config.test files for swr
swr: play the correct speed. nb_samples means sampes per channel
swr: refine code. add comments
Merge branch 'master' into dev
Merge branch 'swr' into dev
buggy speed control
deal with EAGAIN. see ffmpeg(usleep 10000?)
player: renderer menu is clickable and keeps visible